pm-qa: Add power management test utils

* The power management test utilities from Linaro can be used
  to test multiple PM features such as cpufreq, cpuidle, thermal
  control and suspend operations.
* These utilities are not platform specific and can be used by
  a broader base of users.

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>