Describe LVDS data mapping of the LVDS-to-DPI decoder input port.
This fixes a warning reported by lvds-codec driver:
"
lvds-codec lvds-decoder: missing 'data-mapping' DT property
"
Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org>