ARM: SAMSUNG: Add core clock implementation for clksrc based clocks

Add a core for the clksrc clock implementation, which is found in many of
the newer Samsung SoCs into plat-samsung.

Signed-off-by: Harald Welte <laforge@gnumonks.org>
[ben-linux@fluff.org: split from original patch to make change smaller]
[ben-linux@fluff.org: split clk and clksrc changes]
[ben-linux@fluff.org: moved to plat-samsung from plat-s3c]
[ben-linux@fluff.org: re-wrote headers after splits]
[ben-linux@fluff.org: added better documentation to headers]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index 486a0d6..e3ae68472 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -13,5 +13,10 @@
 
 if PLAT_SAMSUNG
 
+config SAMSUNG_CLKSRC
+	bool
+	help
+	  Select the clock code for the clksrc implementation
+	  used by newer systems such as the S3C64XX.
 
 endif