regulator: Updates for v5.1

The bulk of the standout changes in this release are cleanups, with the
core work being a combination of factoring out common code into helpers
and the completion of the conversion of the core to use GPIO
descriptors.

 - Addition of helper functions for current limits and conversion of
   drivers to use them by Axel Lin.
 - Lots and lots of cleanups from Axel Lin.
 - Conversion of the core to use GPIO descriptors rather than numbers by
   Linus Walleij.
 - New drivers for Maxim MAX77650 and ROHM BD70528.
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Merge branch 'regulator-5.1' into regulator-next