ARM: dts: sun5i: q8-tablet: Move panel properties to correct node level

The panel backlight and enable GPIO comments were incorrectly placed
in the input port, while it should have been in the panel node itself.

Move them to the correct position.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>