dt-bindings: clock: mediatek: add syscon compatible for mt7622 pciesys

Add required syscon compatible for mt7622 pciesys. This is required for
SATA interface as the regs are shared.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20240628105542.5456-2-ansuelsmth@gmail.comReviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/mediatek,mt7622-pciesys.yaml

@@ -14,9 +14,11 @@ maintainers:
 
 properties:
   compatible:
-    enum:
-      - mediatek,mt7622-pciesys
-      - mediatek,mt7629-pciesys
+    oneOf:
+      - items:
+          - const: mediatek,mt7622-pciesys
+          - const: syscon
+      - const: mediatek,mt7629-pciesys
 
   reg:
     maxItems: 1
@@ -38,7 +40,7 @@ additionalProperties: false
 examples:
   - |
     clock-controller@1a100800 {
-        compatible = "mediatek,mt7622-pciesys";
+        compatible = "mediatek,mt7622-pciesys", "syscon";
         reg = <0x1a100800 0x1000>;
         #clock-cells = <1>;
         #reset-cells = <1>;