ARM: dts: imx6dl-mamoj: Add parallel display support

This patch adds parallel display support for i.MX6DL Mamoj board
along with relevant backlight through pwm.

LCD power sequence is added by 'Michael Trimarchi'.

Signed-off-by: Simone CIANNI <simone.cianni@bticino.it>
Signed-off-by: Raffaele RECALCATI <raffaele.recalcati@bticino.it>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>