dt-bindings: Add Mantix MLAF057WE51-X panel bindings

The panel uses a Focaltech FT8006p, the touch part is handled by the
already existing edt-ft5x06.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/b84c8c00ee1dcf545903a475872e1ae62b5f43ea.1597652012.git.agx@sigxcpu.org