ARM: dts: imx6q-icore: Add LVDS support

Add LVDS display support for OpenFrame Capacitive touch 7 inc
display which is supported by Engicam i.CoreM6 QDL Starter Kit.

Cc: Domenico Acri <domenico.acri@engicam.com>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>