dt-bindings: pinctrl: qcom,pmic-mpp: Rename "mpp" child node names to "-pins$"

Just 'mpp' is a bit ambiguous for a pattern as it allows any prefix or
suffix. Change the node name pattern to "-pins$" to align with other
Qualcomm pinctrl bindings.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230120165103.1278852-1-robh@kernel.orgSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Documentation/devicetree/bindings/pinctrl/qcom,pmic-mpp.yaml

@@ -74,7 +74,7 @@ patternProperties:
     oneOf:
       - $ref: "#/$defs/qcom-pmic-mpp-state"
       - patternProperties:
-          "mpp":
+          '-pins$':
             $ref: "#/$defs/qcom-pmic-mpp-state"
         additionalProperties: false
 
@@ -179,7 +179,7 @@ examples:
       };
 
       default-state {
-        gpio-mpp {
+        gpio-pins {
           pins = "mpp1", "mpp2", "mpp3", "mpp4";
           function = "digital";
           input-enable;