mt76: fix compilation warning in mt76_eeprom_override()

Fix the following compilation warning in mt76_eeprom_override routine
when CONFIG_OF is not set and label 'out' is not actually used

drivers/net/wireless/mediatek/mt76/eeprom.c: In function ‘mt76_eeprom_override’:
drivers/net/wireless/mediatek/mt76/eeprom.c:100:1: warning: label ‘out’ defined but not used [-Wunused-label]

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>