dt-bindings: lcdif: add lcd panel related property for imx28

dt-bindings: lcdif: add lcd panel related property for imx28

Allow lcd panel related property for imx28 and keep the same restriction
for other platform. It is legancy platform and set these property to
deprecated.

Fix below CHECK_DTB warnings:
arch/arm/boot/dts/nxp/mxs/imx28-apx4devkit.dtb: lcdif@80030000 (fsl,imx28-lcdif): 'display', 'display0' do not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250529200520.798117-1-Frank.Li@nxp.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>