ar71xx: add support for qca956x soc

This patch adds soc support for QCA9561 and TP9343.
TP9343 is a reduced version of QCA9561, which can be found in TP-LINK routers in China.
The qca956x_wmac has not yet been supported by ath9k.

tested on TL-WDR6500 and TL-WR882N v1 (Chinese version)

Signed-off-by: Weijie Gao <hackpascal@gmail.com>

SVN-Revision: 43744

target/linux/ar71xx/config-3.14

@@ -292,6 +292,7 @@ CONFIG_SOC_AR933X=y
 CONFIG_SOC_AR934X=y
 CONFIG_SOC_QCA953X=y
 CONFIG_SOC_QCA955X=y
+CONFIG_SOC_QCA956X=y
 CONFIG_SPI=y
 CONFIG_SPI_AP83=y
 CONFIG_SPI_ATH79=y