dt-bindings: mfd: Add compatible for pmx75

Add compatible for pmic pmx75 used in Snapdragon series.
Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/1688395346-3126-6-git-send-email-quic_rohiagar@quicinc.comSigned-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/qcom,spmi-pmic.yaml

@@ -89,6 +89,7 @@ properties:
           - qcom,pms405
           - qcom,pmx55
           - qcom,pmx65
+          - qcom,pmx75
           - qcom,smb2351
       - const: qcom,spmi-pmic