imx: mx6slevk: introduce device tree support

Introduce device tree support.
dts from kernel commit c4f3f22edd Merge tag 'linux-kselftest-4.11-rc1'

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