regulator: dt-bindings: Add PMX55 compatibles

Add PMX55 compatibles for PMIC found in SDX55 platform
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20201126093018.1085594-1-vkoul@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.txt

@@ -30,6 +30,7 @@ Supported regulator node names:
 	PMI8998:	bob
 	PM6150:         smps1 - smps5, ldo1 - ldo19
 	PM6150L:        smps1 - smps8, ldo1 - ldo11, bob
+	PMX55:		smps1 - smps7, ldo1 - ldo16
 
 ========================
 First Level Nodes - PMIC
@@ -47,6 +48,7 @@ First Level Nodes - PMIC
 		    "qcom,pmi8998-rpmh-regulators"
 		    "qcom,pm6150-rpmh-regulators"
 		    "qcom,pm6150l-rpmh-regulators"
+		    "qcom,pmx55-rpmh-regulators"
 
 - qcom,pmic-id
 	Usage:      required