Alarm: Port driver changes to R3-ICS

Alarm: Port driver changes to R3-ICS

BZ: 19303

This patch has the defect-fixes/enhancements from R2-stable to R3-ICS,
for alarm driver.
The major changes are w.r.t the alarm type POWER_OFF_WAKEUP, which
supports wakeup from poweroff state.

Change-Id: I4ddabe02bf78aa9561b49bd97df85f5afac8564d
Signed-off-by: Pavan Kumar S <pavan.kumar.s@intel.com>
Reviewed-on: http://android.intel.com:8080/32363
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Reviewed-by: Tc, Jenny <jenny.tc@intel.com>
Reviewed-by: Hari, NeelamX <neelamx.hari@intel.com>
Reviewed-by: Centelles, Sylvain <sylvain.centelles@intel.com>
Tested-by: Gugwad, SantoshX <santoshx.gugwad@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>