regulator: Updates for v3.15

This release has lots and lots of small cleanups and fixes in the
regulator subsystem, mainly cleaning up some bad patterns that got
duplicated in DT code, but otherwise very little of note outside
of the scope of the relevant drivers:

 - Support for configuration of the initial state for gpio regulators
   with multi-voltage support.
 - Support for calling regulator_set_voltage() on fixed regulators.
 - New drivers for Broadcom BCM590xx, Freescale pfuze200, Samsung S2MPA01 &
   S2MPS11/4, some PWM controlled regulators found on some ST boards and
   TI TPS65218.
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