video: panel: add LG LG070WX3 MIPI DSI panel driver

The LD070WX3 is a Color Active Matrix Liquid Crystal Display with
an integral Light Emitting Diode (LED) backlight system. The
matrix employs a-Si Thin Film Transistor as the active element. It
is a transmissive type display operating in the normally Black
mode. This TFT-LCD has 7.0 inches diagonally measured active
display area with WXGA resolution (800 by 1280 pixel array).

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>