ARM: dts: imx6ull-colibri: Set LCDIF bus width

The Colibri family standard defines an 18-bit parallel RGB interface on
the edge connector. The additional six LCDIF data signals required for a
24-bit interface are mapped to module-specific pins whose location is not
fixed across the Colibri family and which may not be available at all.

Generic Colibri carrier boards can therefore only rely on an 18-bit
interface. Set the LCDIF bus-width property accordingly.

A 24-bit interface can still be used by a specific carrier and module
combination by overriding the property in the carrier board device tree.

Link: https://docs.toradex.com/104446-colibri-arm-som-imx6ull-datasheet.pdf
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

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