Add initial support for imx6ul pico hobbit board.

For information about this board, please visit:
http://www.wandboard.org/images/hobbit/hobbitboard-imx6ul-reva1.pdfSigned-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>