ARM: at91: Move CONFIG_AT91FAMILY option to Kconfig

Move the CONFIG_AT91FAMILY option from include/mach/<soc>.h header
file to Kconfig.

Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index a70b956..513963c 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -1,5 +1,8 @@
 if ARCH_AT91
 
+config AT91FAMILY
+	def_bool y
+
 choice
 	prompt "Atmel AT91 board select"
 	optional