rtl8xxxu: Do not backup RF_MODE_AG when it's never being used

This was expired by the vendor driver, but we never ended up using the
backed up value.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c

@@ -7667,9 +7667,6 @@ static int rtl8xxxu_init_device(struct ieee80211_hw *hw)
 	if (priv->rtl_chip != RTL8192E)
 		rtl8xxxu_write32(priv, REG_FPGA0_XA_RF_INT_OE, 0x66f60210);
 
-	priv->rf_mode_ag[0] = rtl8xxxu_read_rfreg(priv, RF_A,
-						  RF6052_REG_MODE_AG);
-
 	if (!macpower) {
 		/*
 		 * Set TX buffer boundary

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h

@@ -1228,7 +1228,6 @@ struct rtl8xxxu_priv {
 	u8 rf_paths;
 	u8 rx_paths;
 	u8 tx_paths;
-	u32 rf_mode_ag[2];
 	u32 rege94;
 	u32 rege9c;
 	u32 regeb4;