wifi: mt76: mt7996: support mt7996 2+3+3 variant

[dangowrt]

Add support for mt7996 tri-band 2+3+3 variant.
This setup is used for the BE14000 module sold by SinoVoip for the BananaPi R4 as well as Adtran SDG-8733A.
MediaTek yet has to release matching firmware files to the public.

[openips]

nice

[rany2]

There's this patch in the mtk-openwrt-feeds which might help: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/refs/heads/master/autobuild/autobuild_5.4_mac80211_release/mt7988_wifi7_mac80211_mlo/package/kernel/mt76/patches/0057-mtk-mt76-mt7996-add-Eagle-2adie-TBTC-BE14000-support.patch

Also the firmware is available here: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/refs/heads/master/autobuild/autobuild_5.4_mac80211_release/package/kernel/mt76/src/firmware/mt7996/

I don't know if any of this is in a working state though.

[rmandrad]

this commit works fine on the bpi-r4 and the be14 wifi add-on

[Alexey71]

Yes works. Only 2G 5G 6G display diodes do not work

[rmandrad]

what you mean "diodes do not work"?

[Alexey71]

The LEDs on BE14 should light blue and flash when active

[rmandrad]

oh yes the leds ... the same here

[rmandrad]

@nbd168 any reason for this not be applied ?

[nbd168]

I rarely look at pull requests to this repository, since the main development for the driver happens upstream. I'd prefer if this change is sent to linux-wireless, targeting my wireless-next tree.