apple_bce/vhci: add T2 virtual USB host controller

Implements a VHCI driver on top of the BCE transport:
- Virtual USB bus registration via usb_controller
- Port discovery and device enumeration
- C

apple_bce/vhci: add T2 virtual USB host controller

Implements a VHCI driver on top of the BCE transport:
- Virtual USB bus registration via usb_controller
- Port discovery and device enumeration
- Control, interrupt, and bulk endpoint support
- Firmware event handling with taskqueue
- Suspend/resume via BCE mailbox

Provides keyboard, trackpad, and Touch Bar access on T2 Macs.

Tested-on: MacBookPro16,2 (A2251), Mac mini 8,1 (A1993)

Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D57089

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apple_bce: add Apple T2 Buffer Copy Engine driver

DMA ring transport between the host and the T2 coprocessor.
Provides mailbox handshake, queue setup, and firmware keepalive
for higher-level T2 serv

apple_bce: add Apple T2 Buffer Copy Engine driver

DMA ring transport between the host and the T2 coprocessor.
Provides mailbox handshake, queue setup, and firmware keepalive
for higher-level T2 services (VHCI, audio, etc.).

Tested-on: MacBookPro16,2 (A2251), Mac mini 8,1 (A1993)

Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D57088

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