[ARM] S3C: Make <mach/timex.h> common

Move <mach/timex.h> to arch/arm/plat-s3c/include/mach/timex.h
so it can be the default for all S3C based architectures.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

diff --git a/arch/arm/mach-s3c2410/include/mach/timex.h b/arch/arm/plat-s3c/include/mach/timex.h
similarity index 100%
rename from arch/arm/mach-s3c2410/include/mach/timex.h
rename to arch/arm/plat-s3c/include/mach/timex.h