ARM: clps711x: Added simple clock framework

Modern CPUs from CLPS711X-line can operate at frequencies other than 73 MHz.
This patch adds simple clock framework for handling all possible CPU rates.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2f88d8d..0e76721 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -384,6 +384,8 @@
 	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
 	select CPU_ARM720T
 	select ARCH_USES_GETTIMEOFFSET
+	select COMMON_CLK
+	select CLKDEV_LOOKUP
 	select NEED_MACH_MEMORY_H
 	help
 	  Support for Cirrus Logic 711x/721x/731x based boards.