wifi: mt76: mt7996: Introduce RRO MSDU callbacks

wifi: mt76: mt7996: Introduce RRO MSDU callbacks

Introduce rx_rro_ind_process and rx_rro_add_msdu_page callbacks and the
related logic in the MT7996 driver. This is a preliminary patch to
decouple RRO logic from WED support and reuse RRO when WED module is not
available.

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-v5-12-7d66f6eb7795@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>