dt-bindings: display: Add OSD Displays OSD070T1718-19TS panel binding

The OSD Displays OSD070T1718-19TS is a 7" WVGA (800x480) 24bit RGB panel
and is compatible with the simple-panel bindings.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>