ARM: at91: Add sam9x60 soc

Add new Microchip sam9x60 SoC based on an ARM926.

Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun@microchip.com>
[tudor.ambarus@microchip.com: fix SFR definition]
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 1434328..3cf1304 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -43,6 +43,10 @@
 	bool
 	select CPU_ARM926EJS
 
+config SAM9X60
+	bool
+	select CPU_ARM926EJS
+
 config SAMA5D2
 	bool
 	select CPU_V7A