dt-bindings: pinctrl: qcom,pmic-mpp: Document PM8226 compatible

Document the Device Tree binding for PM8226 MPPs.
Signed-off-by: NRayyan Ansari <rayyan@ansari.sh>
Acked-by: NRob Herring <robh@kernel.org>
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220124171538.18088-1-rayyan@ansari.shSigned-off-by: NLinus Walleij <linus.walleij@linaro.org>

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

@@ -21,6 +21,7 @@ properties:
           - qcom,pm8019-mpp
           - qcom,pm8038-mpp
           - qcom,pm8058-mpp
+          - qcom,pm8226-mpp
           - qcom,pm8821-mpp
           - qcom,pm8841-mpp
           - qcom,pm8916-mpp