rtl8xxxu: Use REG_RFE_CTRL_ANTA_SRC rather than hard coded value

Another case where we should use the register name rather than the
hard coded value when accessing it.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -2950,10 +2950,10 @@ static void rtl8723bu_phy_init_antenna_selection(struct rtl8xxxu_priv *priv)
 	val32 |= (BIT(0) | BIT(1));
 	rtl8xxxu_write32(priv, REG_RFE_BUFFER, val32);
 
-	val32 = rtl8xxxu_read32(priv, 0x0930);
+	val32 = rtl8xxxu_read32(priv, REG_RFE_CTRL_ANTA_SRC);
 	val32 &= 0xffffff00;
 	val32 |= 0x77;
-	rtl8xxxu_write32(priv, 0x0930, val32);
+	rtl8xxxu_write32(priv, REG_RFE_CTRL_ANTA_SRC, val32);
 
 	val32 = rtl8xxxu_read32(priv, REG_PWR_DATA);
 	val32 |= PWR_DATA_EEPRPAD_RFE_CTRL_EN;