brcmfmac: deal with bus attachments to the module Makefile

As with LinuxKPI-based wireless drivers, e.g., rtw88, PCI depends
on PCI being compiled into the kernel, SDIO will depend on
MMCCAM in the

brcmfmac: deal with bus attachments to the module Makefile

As with LinuxKPI-based wireless drivers, e.g., rtw88, PCI depends
on PCI being compiled into the kernel, SDIO will depend on
MMCCAM in the kernel once supported, and USB can always be
loaded.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

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brcm80211: add LinuxKPI files and module Makefiles

sys/compat/linuxkpi/common/include/linux/platform_data/brcmfmac.h
is based on
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
e5f0a698b3

brcm80211: add LinuxKPI files and module Makefiles

sys/compat/linuxkpi/common/include/linux/platform_data/brcmfmac.h
is based on
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
e5f0a698b34ed76002dc5cff3804a61c80233a7a ( tag: v6.17 ).

Currently only PCIe is made to compile.
It does load firmware (if needed, e.g., on arm64 with an alignment
issue fixed), and starts to come up.

To make it work there is a cfg80211 layer and netdevice integration
to do, so do not hold your breath just yet.

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