video/drm: of: Add drm_of_lvds_get_dual_link_pixel_order

This patch is derived from the kernel and modifies parts of
it to support uboot dts API.

drm_of_lvds_get_dual_link_pixel_order supports the

video/drm: of: Add drm_of_lvds_get_dual_link_pixel_order

This patch is derived from the kernel and modifies parts of
it to support uboot dts API.

drm_of_lvds_get_dual_link_pixel_order supports the odd and
even channels which already present in the kernel as well
as the left and right channels specific to Rockchip SoCs.

Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
Change-Id: I8b4d3d0367669c48ed6e8ea552faedb330f99b81

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