Power management fixes for v4.7-rc7

 - Fix a recent performance regression on Power systems (powernv
   and pseries) introduced by a core cpuidle commit that decreased
   the precision of the last_residency conversion from nano- to
   microseconds, which should not matter in theory, but turned out
   to play not-so-well with the special "snooze" idle state on Power
   (Shreyas B Prabhu).

 - Fix a crash during resume from hibernation on x86-64 caused by
   possible corruption of the kernel text part of page tables in the
   last phase of image restoration exposed by a security-related
   change during the 4.3 development cycle (Rafael Wysocki).
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