dt-bindings: display: simple: add Innolux G070Y2-T02 panel

Add binding for the Innolux G070Y2-T02 panel. It is 7" WVGA (800x480)
TFT LCD panel with TTL interface and a backlight unit.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210930100501.15690-1-o.rempel@pengutronix.de