Merge branches 'pm-sleep', 'pm-em', 'pm-cpu', 'pm-misc' and 'pm-tools'

Merge updates related to system sleep, an energy model handling update,
a generic CPU PM driver update, a clock framework PM update, and a
pm-graph utility update for 7.4:

 - Ignore page-zero RAM in E820 checksum during hibernation on x86 to
   avoid rejecting images created after kexec() (Matthias Goergens)

 - Add resume event mapping for PMSG_POWEROFF to the PM core to allow it
   to carry out device shutdown in the future (Mario Limonciello)

 - Add DPM watchdog to prepare/late/early/noirq/complete phases of
   device suspend and resume (Mayank Rungta)

 - Update swsusp.txt references to swsusp.rst in hibernation
   documentation (Li Jun)

 - Fix use-after-free of perf domain in netlink doit handlers for energy
   models (Fan Wu)

 - Add synchronize_rcu() back to cpu_pm_unregister_notifier() after it
   was removed inadvertently in previous development cycles to avoid
   use-after-free (Bradley Morgan)

 - Unregister CPU PM notifier outside the timer lock in the timer-ti-dm
   clocksource driver (Bradley Morgan)

 - Fix typo "sucessfully" in a comment in pm_clk_add_clk() kerneldoc
   comment and typo "hierachy" in a comment in pm-graph (Hemanth Selam)

* pm-sleep:
  x86/hibernate: Ignore page-zero RAM in E820 checksum
  PM: sleep: Add resume event mapping for PMSG_POWEROFF
  PM: sleep: Add DPM watchdog to prepare/late/early/noirq/complete phases
  PM: hibernate: docs: update swsusp.txt references to swsusp.rst

* pm-em:
  PM: EM: Fix use-after-free of perf domain in netlink doit handlers

* pm-cpu:
  PM: CPU: Restore synchronize_rcu() to cpu_pm_unregister_notifier()
  clocksource/drivers/timer-ti-dm: Unregister CPU PM notifier outside of the timer lock

* pm-misc:
  PM: clk: fix typo "sucessfully" in comment

* pm-tools:
  tools: power: pm-graph: fix typo "hierachy" in comment