regulator: dt-bindings: qcom,sdm845-refgen-regulator: document more platforms

Document refgen block being present on SDM670, Lemans and QCS8300
platforms. It should be used to provide reference voltage to DSI
controller.

Signed-off-by: Dmitry Baryshkov <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/regulator/qcom,sdm845-refgen-regulator.yaml

···
           - enum:
               - qcom,sc7180-refgen-regulator
               - qcom,sc8180x-refgen-regulator
+              - qcom,sdm670-refgen-regulator
               - qcom,sm8150-refgen-regulator
           - const: qcom,sdm845-refgen-regulator
 
       - items:
           - enum:
+              - qcom,qcs8300-refgen-regulator
+              - qcom,sa8775p-refgen-regulator
               - qcom,sc7280-refgen-regulator
               - qcom,sc8280xp-refgen-regulator
               - qcom,sm6350-refgen-regulator