dt-bindings: pinctl: amlogic,pinctrl-a4: Add compatible string for S7/S7D/S6

Update dt-binding document for pinctrl of Amlogic S7/S7D/S6.

Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/20250527-s6-s7-pinctrl-v3-1-44f6a0451519@amlogic.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/amlogic,pinctrl-a4.yaml

@@ -15,11 +15,18 @@ allOf:
 properties:
   compatible:
     oneOf:
-      - const: amlogic,pinctrl-a4
+      - enum:
+          - amlogic,pinctrl-a4
+          - amlogic,pinctrl-s6
+          - amlogic,pinctrl-s7
       - items:
           - enum:
               - amlogic,pinctrl-a5
           - const: amlogic,pinctrl-a4
+      - items:
+          - enum:
+              - amlogic,pinctrl-s7d
+          - const: amlogic,pinctrl-s7
 
   "#address-cells":
     const: 2