mt76: add mt7615 to the pile of buildable drivers

Ignoring page_pools with the few needed adjustments and ignoring 7622
mt7615 seems to build as well. Add it so once we can connect it to
the build

mt76: add mt7615 to the pile of buildable drivers

Ignoring page_pools with the few needed adjustments and ignoring 7622
mt7615 seems to build as well. Add it so once we can connect it to
the build people can start testing and debugging.
(The actual work was done on a newer version of the mt76 drivers but
it seems the to-build-changes equally apply here already).

Requested by: Radu-Cristian Fotescu (freebsd-wireless, 2024-07-31)
Sponsored by: The FreeBSD Foundation
MFC after: 3 days

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mt76: update driver from upstream

This is a set of updates of the mt76 driver based on wireless-testing
(wt-2023-05-11) 711dca0ca3d77414f8f346e564e9c8640147f40d (after v6.4-rc1),
This adds support

mt76: update driver from upstream

This is a set of updates of the mt76 driver based on wireless-testing
(wt-2023-05-11) 711dca0ca3d77414f8f346e564e9c8640147f40d (after v6.4-rc1),
This adds support for mt7996 as well.
(wt-2023-06-09) 7bd20e011626ccc3ad53e57873452b1716fcfaaa (after v6.4-rc5),
(wt-2023-07-24) 62e409149b62a285e89018e49b2e115757fb9022 (after v6.5-rc3),
(wt-2023-08-06) 2a220a15be657a24868368892e3e2caba2115283 (after v6.5-rc4).

The current version of LinuxKPI lacks support for "page pool" which
needs enhancing and updating a decade or so old shortcut mapping
struct page directly to struct vm_page.

MFC after: 20 days

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mt76: import mediatek/mt76 driver

Import ISC-licensed driver parts of mediatek/mt76
assumed to be based on Linux wireless-testing at
a02411a5b98612c12be99349836d99f07db12a77 (tag: wt-2022-11-23).

C

mt76: import mediatek/mt76 driver

Import ISC-licensed driver parts of mediatek/mt76
assumed to be based on Linux wireless-testing at
a02411a5b98612c12be99349836d99f07db12a77 (tag: wt-2022-11-23).

Complement the driver and LinuxKPI with our own (dummy)
implementations of missing parts (util.h and soc/mediatek/)
as well as changes to make compile on FreeBSD with changes
covered by #ifdef (__FreeBSD__) conditions.
Further select updates were applied since the initial import
in order to keep compiling along with other LinuxKPI based
drivers.

For the moment we only target the mt7915 and mt7921 PCI parts.
More may follow in the future.

Firmware is provided by port net/wifi-firmware-mt76-kmod.

Given the lack of full license texts on non-local files this is
imported under the draft policy for handling SPDX files (D29226). [1]

Approved by: core (emaste, 2022-04-08) [1]
MFC after: 2 months

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