wifi: mt76: mt7921: add unified ROC cmd/event support

Add unified ROC cmd/event which is only supported by the newer fw.

Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Co-developed-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Co-developed-by: Kaikai Hu <kaikai.hu@mediatek.com>
Signed-off-by: Kaikai Hu <kaikai.hu@mediatek.com>
Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>