mt76: mt7615: store N9 firmware version instead of CR4

CR4 is used very little, N9 is the main firmware that the driver interacts with

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-12-17 04:59:05 +01:00
commit 4e569727da