rt2x00: Add antenna setting for RT3070/RT3090/RT3390 with RX antenna diversity support

For RT3070/RT3090/RT3390 with RX antenna diversity support, we must select
default antenna using gpio control way even if we do not turn on
antenna diversity feature.

Seperate the meaning of TX/RX chain and antenna. Some chips use
2x2 TX/RX chain but may have 3 RX antennas or 1x1 TX/RX chain
but may have 2 RX antennas to do antenna diversity.

Signed-off-by: RA-Jay Hung <jay_hung@ralinktech.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800.h b/drivers/net/wireless/rt2x00/rt2800.h
index ec8159c..ef8f605 100644
--- a/drivers/net/wireless/rt2x00/rt2800.h
+++ b/drivers/net/wireless/rt2x00/rt2800.h
@@ -270,6 +270,7 @@
 
 /*
  * GPIO_CTRL_CFG:
+ * GPIOD: GPIO direction, 0: Output, 1: Input
  */
 #define GPIO_CTRL_CFG			0x0228
 #define GPIO_CTRL_CFG_BIT0		FIELD32(0x00000001)
@@ -281,6 +282,7 @@
 #define GPIO_CTRL_CFG_BIT6		FIELD32(0x00000040)
 #define GPIO_CTRL_CFG_BIT7		FIELD32(0x00000080)
 #define GPIO_CTRL_CFG_BIT8		FIELD32(0x00000100)
+#define GPIO_CTRL_CFG_GPIOD		FIELD32(0x00000800)
 
 /*
  * MCU_CMD_CFG
@@ -2068,6 +2070,7 @@
 #define MCU_LED_LED_POLARITY		0x54
 #define MCU_RADAR			0x60
 #define MCU_BOOT_SIGNAL			0x72
+#define MCU_ANT_SELECT			0X73
 #define MCU_BBP_SIGNAL			0x80
 #define MCU_POWER_SAVE			0x83