dt-bindings: arm: mediatek: Add mt8186 pericfg compatible

Add mt8186 pericfg compatible to binding document.
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220520122217.30716-2-allen-kh.cheng@mediatek.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Documentation/devicetree/bindings/arm/mediatek/mediatek,pericfg.yaml

@@ -26,6 +26,7 @@ properties:
               - mediatek,mt8135-pericfg
               - mediatek,mt8173-pericfg
               - mediatek,mt8183-pericfg
+              - mediatek,mt8186-pericfg
               - mediatek,mt8195-pericfg
               - mediatek,mt8516-pericfg
           - const: syscon