imx: mx6sx: add dts for mx6sxsabreauto board

Add dts for mx6sxsabreauto board.
dts related files imported fro Linux (commit e5517c2a5a4).

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
6 files changed