regulator: add MP5496 regulator compatible

IPQ6018 uses the PMIC MP5496. Add the binding for the same.
Signed-off-by: NKathiravan T <kathirav@codeaurora.org>
Link: https://lore.kernel.org/r/1592889472-6843-4-git-send-email-kathirav@codeaurora.orgSigned-off-by: NMark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/qcom,smd-rpm-regulator.txt

@@ -19,6 +19,7 @@ Regulator nodes are identified by their compatible:
 	Usage: required
 	Value type: <string>
 	Definition: must be one of:
+		    "qcom,rpm-mp5496-regulators"
 		    "qcom,rpm-pm8841-regulators"
 		    "qcom,rpm-pm8916-regulators"
 		    "qcom,rpm-pm8941-regulators"