[ARM] clkdev: add generic clkdev infrastructure

Add some generic infrastructure to assist looking up struct clks
for the ARM architecture.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index 86b5e69..a2cd9be 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -33,3 +33,6 @@
 
 config SHARP_SCOOP
 	bool
+
+config COMMON_CLKDEV
+	bool