dt-bindings: display: simple: Add Kyocera tcg070wvlq panel

So far, this panel seems to be compatible with "lg,lb070wv8", on other
hand it is better to set this compatible in the devicetree. So, let's
add it for now only to the dt-binding documentation to fix the
checkpatch warnings.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>