Remove hw_atomic_mutex mutex in mt76x0_dev data structure
since mt76x0_phy_set_channel is already protected by mt76_dev
mutex while mt76x0_chip_onoff is used just at device probe or
cleanup
Signed-off-by: NLorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>