regulator: Updates for v4.1

Another release, another set of regulator updates.  Not much of it is
showing up in the code yet but there's been a lot of discussion going on
about how to enhance the regulator API to work better with modern SoCs
which have a microcontroller sitting between Linux and the hardware.
I'm hopeful that'll start to come through into mainline for v4.2 but
it's not quite there for v4.1 - what we do have (along with the usual
small updates is) is:

 - Work from Bjorn Andersson on refactoring the configuration of
   regulator loading interfaces to be useful for use with
   microcontrollers, the existing interfaces were never actually useful
   for anything as-is since nobody was willing to put enough data into
   public code.
 - A summary tree display in debugfs from Heiko Stübner.
 - Support for act6000 regulators.
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