Merge changes I8473f230,I745b7278,I2a4e11e2,I54f353f3 into dev/msm-4.9-sched

* changes:
  sched: cpufreq: Use per_cpu_ptr instead of this_cpu_ptr when reporting load
  sched: cpufreq: Use sched_clock instead of rq_clock when updating schedutil
  sched: cpufreq: Update cpufreq once in a WALT window
  ARM: dts: msm: Add an energy model for the SDM845 CPUs