LinuxKPI wlan drivers: update makefiles to not use WITH_

Up to now the LinuxKPI wlan drivers were using local variables starting
with a WITH_ prefix in their Makefiles.
That is likely to collide wit

LinuxKPI wlan drivers: update makefiles to not use WITH_

Up to now the LinuxKPI wlan drivers were using local variables starting
with a WITH_ prefix in their Makefiles.
That is likely to collide with other mechanisms like WITH_ and WITHOUT_
from src.conf.
Adjust the local variables to use a driver name prefix for now to control
what is built and what is not.
These variables are mainly for the time of development so we can
turn off/on a feature or bus attachment while working on it. Otherwise
they are there for documentation purposes. The only reason one would
change them locally would be if someone was to build a very custom
image and not want certain bits (e.g., USB support) being compiled into
the modules.

While here, try to harmonize some parts of the Makefiles.

Suggested by: imp
Discussed with: imp
Reviewed by: imp
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D55977

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mt76: module Makefiles fix .PATH

The common Makefile.inc had the .PATH set for the common code.
That .PATH is only needed for the mt76_core module, which shares
code for all other drivers. We leave

mt76: module Makefiles fix .PATH

The common Makefile.inc had the .PATH set for the common code.
That .PATH is only needed for the mt76_core module, which shares
code for all other drivers. We leave the COMMONDIR variable defined
in Makefile.inc as we need it for CFLAGS+= -I for each driver but
migrate the .PATH to avoid drivers picking up the wrong files.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

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mt76: sort bus attachments in module Makefiles for pci and usb

With PCI enabled and USB still disabled add knobs to (i) enabled
them manually in the common Makefile.inc and (ii) add bus
attachment d

mt76: sort bus attachments in module Makefiles for pci and usb

With PCI enabled and USB still disabled add knobs to (i) enabled
them manually in the common Makefile.inc and (ii) add bus
attachment depend knobs where needed to enable them in individual
drivers. For now the focus is in 7921 and 7925.

Sponsored by: The FreeBSD Foundation
MFC atfer: 3 days

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