ARM: EXYNOS4: Add ARMLEX4210 Board support file

This patch adds Samsung ARMLEX4210  board support file
which is based on Exynos4210.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
[kgene.kim@samsung.com: added clk_type for hsmmc3]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>