Merge branches 'pm-core', 'pm-opp' and 'pm-qos'

* pm-core:
  PM / sysfs: Constify attribute groups
  PM: Constify info string used in messages
  PM: Constify returned PM event name
  PM / wakeirq: Convert to SRCU

* pm-opp:
  PM / OPP: Add dev_pm_opp_{set|put}_clkname()
  PM / OPP: Use - instead of @ for DT entries
  PM / OPP: Don't create debugfs "supply-0" directory unnecessarily
  PM / OPP: opp-microvolt is not optional if regulators are set
  PM / OPP: Don't create copy of regulators unnecessarily
  PM / OPP: Reorganize _generic_set_opp_regulator()

* pm-qos:
  PM / QoS: constify *_attribute_group.