arm64: dts: mt8173: Add G2Touch touchscreen node

Lenovo Ideapad C330 Chromebook (MTK) uses G2Touch touchscreen as a
second source component.
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20231115043511.2670477-1-treapking@chromium.org
[Angelo: Rebased and added comment]
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi

@@ -27,6 +27,15 @@ touchscreen3: touchscreen@20 {
 		hid-descr-addr = <0x0020>;
 		interrupts-extended = <&pio 88 IRQ_TYPE_LEVEL_LOW>;
 	};
+
+	/* Lenovo Ideapad C330 uses G2Touch touchscreen as a 2nd source touchscreen */
+	touchscreen@40 {
+		compatible = "hid-over-i2c";
+		reg = <0x40>;
+		hid-descr-addr = <0x0001>;
+		interrupt-parent = <&pio>;
+		interrupts = <88 IRQ_TYPE_LEVEL_LOW>;
+	};
 };
 
 &i2c4 {