Add thread suspend histogram

Helps measure time to suspend.
Example output (maps after a few seconds):
suspend all histogram:  Sum: 2.806ms 99% C.I. 2us-1090.560us Avg: 43.843us Max: 1126us

Change-Id: I7bd9dd3b401fb3e3059e8718556d60910e541611
Merge "Add thread suspend histogram"