dt-bindings: arm: mediatek: mmsys: add vdosys1 compatible for MT8195

Add vdosys1 mmsys compatible for MT8195 platform.

For MT8195, VDOSYS0 and VDOSYS1 are 2 display HW pipelines binding to
2 different power domains, different clock drivers and different
mediatek-drm drivers.

Signed-off-by: Nancy.Lin <nancy.lin@mediatek.com>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230113104434.28023-2-nancy.lin@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>