ARM: dts: add support for EXYNOS4412 based TINY4412 board

Add a minimal board dts file for EXYNOS4412 based FriendlyARM's
TINY4412 board. This patch including support peripherals like
UART, SD card on SDMMC2 port and GPIO connected LEDs.

Signed-off-by: Alex Ling <kasimling@gmail.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>