rt2x00: add MediaTek/RaLink Rt3352 WiSoC

Support for the RT3352 WiSoC was developed for and tested with the ALL5002
devboard running OpenWrt. For now, this supports only devices with internal
TXALC. Corrections were made according to the remarks of Stanislaw Gruszka and
Gertjan van Wingerde, thank you guys for reviewing!
Signed-off-by: Daniel Golle <dgolle@allnet.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800.h

@@ -1942,6 +1942,11 @@ struct mac_iveiv_entry {
 #define BBP47_TSSI_TSSI_MODE		FIELD8(0x18)
 #define BBP47_TSSI_ADC6			FIELD8(0x80)
 
+/*
+ * BBP 49
+ */
+#define BBP49_UPDATE_FLAG		FIELD8(0x01)
+
 /*
  * BBP 109
  */

drivers/net/wireless/rt2x00/rt2x00.h

@@ -188,6 +188,7 @@ struct rt2x00_chip {
 #define RT3071		0x3071
 #define RT3090		0x3090	/* 2.4GHz PCIe */
 #define RT3290		0x3290
+#define RT3352		0x3352  /* WSOC */
 #define RT3390		0x3390
 #define RT3572		0x3572
 #define RT3593		0x3593