ARM: S3C24XX: To merge s3c24xx devs.c files to one devs.c

This patch moves regarding s3c24xx dev files to one devs.c
file in plat-samsung directory and this is required to merge
to plat-samsung.

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>