dt-bindings: pinctrl: qcom,pmic-gpio: Add PM7550 support

Update the Qualcomm Technologies, Inc. PMIC GPIO binding documentation
to include the compatible string for the PM7550 PMICs.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/20250709-sm7635-pmxr2230-v2-3-09777dab0a95@fairphone.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: lweiss-fairphone

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

@@ -27,6 +27,7 @@ properties:
           - qcom,pm6450-gpio
           - qcom,pm7250b-gpio
           - qcom,pm7325-gpio
+          - qcom,pm7550-gpio
           - qcom,pm7550ba-gpio
           - qcom,pm8005-gpio
           - qcom,pm8018-gpio
@@ -263,6 +264,7 @@ allOf:
               - qcom,pm660l-gpio
               - qcom,pm6150l-gpio
               - qcom,pm7250b-gpio
+              - qcom,pm7550-gpio
               - qcom,pm8038-gpio
               - qcom,pm8150b-gpio
               - qcom,pm8150l-gpio