wifi: rt2x00: correct MAC_SYS_CTRL register RX mask in R-Calibration

For MAC_SYS_CTRL register, Bit[2] controls MAC_TX_EN and Bit[3]
controls MAC_RX_EN (Bit index starts from 0). Therefore, 0x08 is
the correct mask for RX.
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/TYAP286MB03150B571B67B896A504AC34BC0EA@TYAP286MB0315.JPNP286.PROD.OUTLOOK.COM

drivers/net/wireless/ralink/rt2x00/rt2800lib.c

@@ -8561,7 +8561,7 @@ static void rt2800_r_calibration(struct rt2x00_dev *rt2x00dev)
 		rt2x00_warn(rt2x00dev, "Wait MAC Tx Status to MAX !!!\n");
 
 	maccfg = rt2800_register_read(rt2x00dev, MAC_SYS_CTRL);
-	maccfg &= (~0x04);
+	maccfg &= (~0x08);
 	rt2800_register_write(rt2x00dev, MAC_SYS_CTRL, maccfg);
 
 	if (unlikely(rt2800_wait_bbp_rf_ready(rt2x00dev, MAC_STATUS_CFG_BBP_RF_BUSY_RX)))