Add a preference to change the alarm timeout.

 Bug: 2654073

Change-Id: I574a148f7fa6e472b57401bf21c9762404c72ce8
Merge commit '28dbcd13adec986d5d2c08b71edab35d84b40958' into oxygen_1006

* commit '28dbcd13adec986d5d2c08b71edab35d84b40958':
  Add a preference to change the alarm timeout.