ARM: dts: Add dts file for S3C6410-based SMDK6410 board

This patch adds basic device tree sources for SAMSUNG SMDK6410 board
based on SAMSUNG S3C6410 SoC.

Currently only UARTs, SD channel 0 and 100Mbps ethernet (SMSC911x) are
supported.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>