Additional power management updates for 5.5-rc1

 - Avoid a race condition in the ACPI EC driver that may cause
   systems to be unable to leave suspend-to-idle (Rafael Wysocki).

 - Drop the "disabled" field, which is redundant, from struct
   cpuidle_state (Rafael Wysocki).

 - Reintroduce device PM QoS frequency constraints (temporarily
   introduced and than dropped during the 5.4 cycle) in preparation
   for adding QoS support to devfreq (Leonard Crestez).

 - Clean up indentation (in multiple places) and the cpuidle drivers
   help text in Kconfig (Krzysztof Kozlowski, Randy Dunlap).
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