dt-bindings: add new compatible to mediatek,pericfg

The PERICFG controller is present on the MT8516 SoC. Add an appropriate
compatible variant.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -25,6 +25,7 @@ properties:
           - mediatek,mt8135-pericfg
           - mediatek,mt8173-pericfg
           - mediatek,mt8183-pericfg
+          - mediatek,mt8516-pericfg
         - const: syscon
       - items:
         # Special case for mt7623 for backward compatibility