ARM: dts: sun8i: Add touchscreen node for sun8i-a23-gt90h

The gt90h 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>

arch/arm/boot/dts/sun8i-a23-gt90h-v4.dts

@@ -53,6 +53,15 @@ &ehci0 {
 	status = "okay";
 };
 
+&touchscreen {
+	reg = <0x40>;
+	compatible = "silead,gsl3675";
+	firmware-name = "gsl3675-gt90h.fw";
+	touchscreen-size-x = <1792>;
+	touchscreen-size-y = <1024>;
+	status = "okay";
+};
+
 &lradc {
 	button@600 {
 		label = "Back";