rtl8xxxu: Correctly mask what was read from REG_CCK0_AFE_SETTING

The old code incorrectly wiped out bits 0-23 by mistake when setting
the RX path for 1T parts.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -3814,7 +3814,7 @@ static int rtl8xxxu_init_phy_bb(struct rtl8xxxu_priv *priv)
 		rtl8xxxu_write32(priv, REG_FPGA1_TX_INFO, val32);
 
 		val32 = rtl8xxxu_read32(priv, REG_CCK0_AFE_SETTING);
-		val32 &= 0xff000000;
+		val32 &= 0x00ffffff;
 		val32 |= 0x45000000;
 		rtl8xxxu_write32(priv, REG_CCK0_AFE_SETTING, val32);