wifi: mt76: mt7996: add support for more variants

wifi: mt76: mt7996: add support for more variants

Current varaints supported:
- mt7996 chipset: tri-band, 4+4+4 NSS, eFEM
- mt7992 chipset: dual-band, 4+4 NSS, eFEM

This patch adds support for the following variants:
- mt7996 chipset:
  - tri-band, 4+4+4 NSS, iFEM
  - tri-band, 2+3+3 NSS, eFEM
  - tri-band, 2+3+3 NSS, iFEM
- mt7992 chipset:
  - dual-band, 4+4 NSS, iFEM
  - dual-band, 4+4 NSS, with band0 iFEM and band1 eFEM
  - dual-band, 2+3 NSS, eFEM
  - dual-band, 2+3 NSS, iFEM

Co-developed-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Link: https://patch.msgid.link/20240926032440.15978-2-shayne.chen@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>