wifi: mt76: mt7996: Add SW path for HW-RRO v3.1

Introduce HW-RRO v3.1 support to be reused when Wireless Ethernet
Dispatcher (WED) is not available. HW-RRO v3.1 is supported by
MT7992 chipset.

Signed-off-by: Rex Lu <rex.lu@mediatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20250909-mt7996-rro-rework-v5-16-7d66f6eb7795@kernel.org


Signed-off-by: Felix Fietkau <nbd@nbd.name>