arm: mxs: video: Enable MXS LCDIF on M28EVK

Enable LCD output support on M28EVK.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Anatolij Gustschin <agust@denx.de>