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(The actual work was done on a newer version of the mt76 drivers but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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Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

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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sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

mt76: add module build framework and man pages

Add framework to build if_mt7915 and if_mt7921 with LinuxKPI
as well as initial man pages for the two mt76 chipset drivers.

MFC after: 2 months