pm-4.20-rc3

 - Drop stale DT binding for the arm_big_little_dt driver removed
   recently (Sudeep Holla).

 - Fix up error handling in the imx6q cpufreq driver to make it
   report voltage scaling failures (Anson Huang).

 - Fix two issues in the cpufreq documentation (Viresh Kumar,
   Zhao Wei Liew).

 - Fix ARM cpuidle driver initialization regression from the 4.19
   time frame and rework the driver registration part of it to
   simplify code (Ulf Hansson).