mx6slevk: Convert to OF_UPSTREAM

Instead of using the local imx6sl-evk, imx6sl-pinfunc.h and
imx6sl.dtsi devicetree copies from U-Boot, convert the imx6sl-evk board
to OF_UPSTREAM so that the upstream kernel devicetree can be used instead.

Signed-off-by: Fabio Estevam <festevam@denx.de>
5 files changed