clk: add highbank clock support

This adds real clock support to Calxeda Highbank SOC using the common
clock infrastructure.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
[mturquette@linaro.org: fixed up invalid writes to const struct member]
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6f8cf40..f3c60ff 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -352,6 +352,7 @@
 	select ARM_TIMER_SP804
 	select CACHE_L2X0
 	select CLKDEV_LOOKUP
+	select COMMON_CLK
 	select CPU_V7
 	select GENERIC_CLOCKEVENTS
 	select HAVE_ARM_SCU