[PATCH] wifi: mt76: pass LED define via ccflags-y in driver submodules

[Mateus B. Cassiano]

On Wed, 15 Jul 2026 00:44:32 -0400, Mateus B. Cassiano wrote:
> mt7996 in particular enables IS_ENABLED(CONFIG_MT76_LEDS) code paths
> that appear to have never been built with the define before, so it
> would be good if someone with mt7996 hardware could confirm nothing
> regresses. I'm happy to drop the mt7996 hunk and keep only the others
> if preferred.

A user has since confirmed on the closed GitHub PR that the patch also
works as expected on mt7996 hardware:

https://github.com/openwrt/mt76/pull/1090#issuecomment-4979596316
https://forum.banana-pi.org/t/bpi-r4-mt7996-be14-per-band-wifi-7-leds-now-work-incl-mlo/27574/11?u=avbohemen