soc: qcom: msm_perf: Detect & notify userspace about heavy CPU loads

Detect single and multi threaded heavy workloads based on loads
received from interactive governor.
- If the max load across all the CPUs is greater than a
  user-specified threshold for certain number of governor windows
  then the load is detected as a single-threaded workload.
- If the total load across all the CPUs is greater than a
  user-specified threshold for certain number of governor windows
  then the load is detected as a multi-threaded workload.
If one of these is detected then a notification is sent to the
userspace so that an entity can read the nodes exposed to get an
idea of the nature of workload running.

Change-Id: Iba75d26fb3981886b3a8460d5f8999a632bbb73a
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>