video: simple_panel: add support for "panel-lvds" display

video: simple_panel: add support for "panel-lvds" display

Add the compatible "panel-lvds" for simple-panel driver in U-Boot.  In
Linux this compatible is managed by the driver
drivers/gpu/drm/panel/panel-lvds.c but in U-Boot the specific LVDS
features (bus_format/bus_flags) are not supported.

Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>