mips: ath79: Add AR934x support

Add support for the Atheros AR934x WiSoCs. This patchs adds complete
system init, including PLL and DRAM init, both of which happen from
full C environment, since the AR934x has proper SRAM.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Wills Wang <wills.wang@live.com>
diff --git a/arch/mips/mach-ath79/Kconfig b/arch/mips/mach-ath79/Kconfig
index f45403b..527960f 100644
--- a/arch/mips/mach-ath79/Kconfig
+++ b/arch/mips/mach-ath79/Kconfig
@@ -13,6 +13,15 @@
 	help
 	  This supports QCA/Atheros ar933x family SOCs.
 
+config SOC_AR934X
+	bool
+	select SUPPORTS_BIG_ENDIAN
+	select SUPPORTS_CPU_MIPS32_R1
+	select SUPPORTS_CPU_MIPS32_R2
+	select MIPS_TUNE_74KC
+	help
+	  This supports QCA/Atheros ar934x family SOCs.
+
 config SOC_QCA953X
 	bool
 	select SUPPORTS_BIG_ENDIAN