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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

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

···
 
 properties:
   compatible:
-    enum:
-      - mediatek,mt7622-pciesys
-      - mediatek,mt7629-pciesys
+    oneOf:
+      - items:
+          - const: mediatek,mt7622-pciesys
+          - const: syscon
+      - const: mediatek,mt7629-pciesys
 
   reg:
     maxItems: 1
···
 examples:
   - |
     clock-controller@1a100800 {
-        compatible = "mediatek,mt7622-pciesys";
+        compatible = "mediatek,mt7622-pciesys", "syscon";
         reg = <0x1a100800 0x1000>;
         #clock-cells = <1>;
         #reset-cells = <1>;