ARM: EXYNOS4: Update Kconfig and Makefile for the new ARCH_EXYNOS4

This patch changes the Kconfig and Makefile for the new ARCH_EXYNOS4.
It also updates arch/arm/Kconfig, Makeifile and arch/arm/mm/Kconfig
to include support for the new ARCH_EXYNOS4.

Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>