dt-bindings: soc: mediatek: add mt8186 and mt8195 svs dt-bindings

Support more SoC svs compatible in dt-bindings.
1. MT8186
2. MT8195

Signed-off-by: Mark Tseng <chun-jen.tseng@mediatek.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>