ARM: dts: colibri_imx7: Fix lcdif node definition

Fix lcdif DT node and make it conform to the structure defined in the
Linux devicetree bindings [1]. Currently there is support only for
old style lcdif node definitions.

[1] https://www.kernel.org/doc/Documentation/devicetree/bindings/display/mxsfb.txt



Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>