ARM: EXYNOS: Remove unused static uart resource information

All supported EXYNOS5 platforms are device tree enabled and hence the
unused static uart resource information is removed.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
[kgene.kim@samsung.com: changed to exynos4_init_uarts() clearly]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>