Move mt76x2_get_rssi_gain_thresh and mt76x2_get_low_rssi_gain_thresh
routines in mt76x02-lib module in order to be reused by mt76x0 driver
for dynamic vga calibration
Signed-off-by: Lorenzo Bianconi <[email protected]>
Signed-off-by: Felix Fietkau <[email protected]>