samples: Add Quark SE power management application

This patch adds a reference Power Management Application (PMA) for
Quark SE based platforms.

This application demostrates how to interact with the PM subsystem
and how to put the SoC in different power states. The application
"modus operandi" is very simple. The application keeps transiting
between all power states supported by Quark SE SoC. For now, C1,
C2 and C2LP CPU states are implemented. Upcoming patches will
add support for the remaining states (LPS and Sleep states).

Change-Id: Id81aadb8bf170fbb2ecfd9483ae250c786619e43
Signed-off-by: Andre Guedes <andre.guedes@intel.com>
Signed-off-by: Iván Briano <ivan.briano@intel.com>