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>