ARM: clps711x: Add clocksource framework

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c7e2a88..fc93deb 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -366,6 +366,7 @@
 	select ARCH_REQUIRE_GPIOLIB
 	select AUTO_ZRELADDR
 	select CLKDEV_LOOKUP
+	select CLKSRC_MMIO
 	select COMMON_CLK
 	select CPU_ARM720T
 	select GENERIC_CLOCKEVENTS