dt-bindings: pinctrl: sunplus,sp7021-pinctrl: reference generic schema

Reference generic pin controller schema to enforce proper root node
name.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220607121335.131497-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/sunplus,sp7021-pinctrl.yaml

@@ -288,11 +288,14 @@ required:
 
 additionalProperties: false
 
+allOf:
+  - $ref: "pinctrl.yaml#"
+
 examples:
   - |
     #include <dt-bindings/pinctrl/sppctl-sp7021.h>
 
-    pinctl@9c000100 {
+    pinctrl@9c000100 {
         compatible = "sunplus,sp7021-pctl";
         reg = <0x9c000100 0x100>, <0x9c000300 0x100>,
               <0x9c0032e4 0x1c>, <0x9c000080 0x20>;