arm64: Add support to vchiq and bcm2835_audio (plus some fixes)

Add 64 bit support to vchiq:

* update fields to the appropriate fixed bit-size variants (everywhere [cf. e.g., ref:sizes and ref:siz

arm64: Add support to vchiq and bcm2835_audio (plus some fixes)

Add 64 bit support to vchiq:

* update fields to the appropriate fixed bit-size variants (everywhere [cf. e.g., ref:sizes and ref:sizes2])
* refer to event semaphores (that go into the very 32 bit VC) by offset instead of pointers [ref:sems]
* dsb() is dsb(sy) in arm64 (vchiq_{core.c,core.h,kmod.c}) [ref:dsb]
* comment out some unneeded code in parse_rx_slots around VCHIQ_MSG_BULK_RX (cf. [ref:deadcode])
* adapt remote_event_signal to arm64 caching behaviours (vchiq_kmod.c)
* refactor synchronization around remote_event_signal, forcing a wmb to be on the safe side; thereby make it look more like what linux does [ref:sync] (vchiq_{core,kmod}.c); and make a comment in vchiq_core.c true (wasn't before)
* add a few more syncs to be on the safe side (vchiq_2835_arm.c)
* use arm64 dcache invalidation mechanisms (vchiq_2835_arm.c)
* explicitly invalidate pages on arm64 post bulk-read (vchiq_2835_arm.c)
* support bulk transfers on rpi-4 (aka "long address space" transfers), by hard-coding their vc offset (0) and different bit-shift [ref:longbulk] (vchiq_2835_arm.c)
* refactor a loop-of-constant-test (vchiq_2835_arm.c)
* use the correct (hard-coded) cache-line size on arm64
* rework the handling of chipset "features" to account for the extra behaviours with 64 bit chipsets. (vchiq_kmod.c)
* add sysctl-s (log, arm_log) to control debug (vchiq_kmod.c)
* add example kernel config (GENERIC-VCHIQ)

Fixes:

* Rework error handling in create_pagelist, avoiding a potential panic when
freeing memory that had been dmamem_alloc, a potential null dereference,
and a leak when having problems pinning pages (vchiq_2835_arm.c)
* fix a confusion about the behaviour cv_wait_sig that lead to
uninterruptible looping (vchiq_bsd.c)
* implement detection of fatal signals (vchiq_bsd.c)
* fix a confusion with the name of a variable introduced by #a0b8746
that could lead to a panic when closing the cdev file (vchiq_arm.c)
* release user connection when destructing cdevpriv and avoid user processes
sharing connection data, which lead to stalls and data corruption. (vchiq_arm.c)

Update bcm2835_audio to work on 64bit systems:

* update VC audio fields (vc_vchi_audioserv_defs.h, bcm2835_audio.c)
* repurpose the hitherto unused callback field to help push a 64 bit pointer in (bcm2835_audio.c)
* increase (hopefully) the robustness of the code that shifts data to VC (bcm2835_audio.c)
* add a sysctl to control the amount of debugging info output by bcm2835_audio.c

Tested on zero, zero2 and 4+ with ping, functional, bulk and control vchiq_test-s, and omxplayer

[ref:dsb]: https://github.com/raspberrypi/linux/commit/35b7ebda57affcfd3616d39d5a727a4495b31123
[ref:sems]: https://github.com/raspberrypi/linux/commit/24a4262afb10907fce3cdbc3ae336fcf4cdaece5
[ref:sizes]: https://github.com/raspberrypi/linux/commit/e64568b8ea6c04e747e432c17ce2452652075216
[ref:sizes2]: https://github.com/raspberrypi/linux/commit/f9bee6dd24addfa00c2c8d50c25b73efbfbb28ba
[ref:deadcode]: https://github.com/raspberrypi/linux/commit/14f4d72fb799a9b3170a45ab80d4a3ddad541960
[ref:sync]: https://github.com/raspberrypi/linux/commit/51c071265079319583e4c6e8c61e09660300d0bf
[ref:longbulk]: https://github.com/raspberrypi/linux/commit/37f6f19a83722c9b866cecb5e455b2e16e5bbc6b

Differential Revision: https://reviews.freebsd.org/D37878
Submitted by: Marco Devesas Campos <devesas.campos@gmail.com>

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arm64: conf: std.broadcom: Add dwcotg and smsc

Add the dwcotg and smsc usb to ethernet driver to std.broadcom.
Those are used in RPI3

PR: 257593

arm64: Add per SoC family kernel config

There is multiple reason for this :
- This makes it easier to see which driver is needed for each SoC
- This makes it easier to create a custom config for one

arm64: Add per SoC family kernel config

There is multiple reason for this :
- This makes it easier to see which driver is needed for each SoC
- This makes it easier to create a custom config for one SoC
- This really reduce boot time (which some people might want)

Some explaination about the files :
- std.arm64 contains all standard kernel option
- std.dev contains all the standard kernel devices
- std.<soc> contains all drivers needed to boot on this SoC family
- <SOC> includes std.arm64, std.dev and std.<soc>
- GENERIC includes std.arm64, std.dev and all std.<soc>

Sponsored by: Diablotin Systems
MFC After: 2 months
Reviewed by: mmel, cognet, imp
Differential Revision: https://reviews.freebsd.org/D30474

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