wifi: mt76: mt7921: fix the firmware version report

Fix the regression of the firmware version report since
'b9ec2710 ('mt76: connac: move mt76_connac2_load_ram in connac
module')'.

Fixes: b9ec2710 ("mt76: connac: move mt76_connac2_load_ram in connac module")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>