ARM: dts: sun8i: Add touchscreen node for sun8i-a33-ga10h

The ga10h tablet has a gsl3675 touchscreen, add a dt node describing it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>