[ARM] sa1100: add clock source support

Add generic clock source support for SA11x0 platforms.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a04f507..7425279 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -366,6 +366,7 @@
 	select ARCH_DISCONTIGMEM_ENABLE
 	select ARCH_MTD_XIP
 	select GENERIC_GPIO
+	select GENERIC_TIME
 	help
 	  Support for StrongARM 11x0 based boards.