SPEAr: Switch to common clock framework

SPEAr SoCs used its own clock framework since now. From now on they will move to
use common clock framework.

This patch updates existing SPEAr machine support to adapt for common clock
framework.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Reviewed-by: Mike Turquette <mturquette@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cf006d4..ce030c2 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -980,6 +980,7 @@
 	select ARM_AMBA
 	select ARCH_REQUIRE_GPIOLIB
 	select CLKDEV_LOOKUP
+	select COMMON_CLK
 	select CLKSRC_MMIO
 	select GENERIC_CLOCKEVENTS
 	select HAVE_CLK