Telephony: Start DataStallAlarm only on Data CONNECTED state

Telephony framework uses AlarmManager for recovery mechanism of data
stalled issue.
Framework configures the ELAPSED_REALTIME_WAKEUP alarm for every
6minutes irrespective of the data state. Due to this,quiet a few
wakeups are seen even when the device is not connected to Mobile
Data network.

Fix is to check the Data connection state before starting
this alarm.

Change-Id: I219bff9199e5ce70bbcd05c95d65731886215fe9
Author: Jeevaka Badrappan <jeevaka.badrappan@intel.com>
Signed-off-by: Jeevaka Badrappan <jeevaka.badrappan@intel.com>
Signed-off-by: Arun Ravindran <arun.ravindran@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 28494