ARM: SAMSUNG: Fix on build warning about dependency in Kconfig

This patch fixes on following build warning.

warning: (PLAT_S5P && (ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PC100 ||
	     ARCH_S5PV210 || ARCH_S5PV310) || ARCH_S3C64XX && <choice>)
	     selects PLAT_SAMSUNG which has unmet direct dependencies
	     (ARCH_S3C2410 || ARCH_S3C24A0 || ARCH_S3C64XX)

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