GlobalActions: Handle 'sleep' action

GlobalActions: Handle 'sleep' action

Some Intel platforms do not provide separate
events for power key press and release. This
makes it impossible to detect long press of
power button. So, the solution is to handle
only short press and add 'sleep' also as an
option in GlobalActions menu. This patch
handles 'sleep' option.

Change-Id: Iaae59b324e5ba6eaed9e507fdaa8e5006535716c
Tracked-On: OAM-56502
Signed-off-by: saranya <saranya.gopal@intel.com>
Signed-off-by: Madhusudhan S <madhusudhan.s@intel.com>