regulator: Updates for v3.20

This has not been a busy release for the regulator framework, though we
do have the first parts of some ongoing work from Bjorn Andersson to
allow us to support more complex modern systems with dynamic
configuration of regulators in suspend and idle states.

 - Support for device-specific properties on regulator nodes when using
   simplified DT parsing in the core from Krzysztof Kozlowski.
 - Restructuring of the load tracking code, intended to support future
   improvements in this area for more complex system designs.
 - New drivers for Maxim MAX77843 and Mediatek MT6397.
 - Lots of smaller fixes and improvements.
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