Use direct callback instead of pending intent for time-out alarm

StkDialogActivity does not need to utilize the protected broadcast
"DIALOG_ALARM_TIMEOUT" if AlarmManager.setExact() is replaced with the
direct callback version of the same method.

Bug: 110065833
Test: Confirmed that the time-out works without the broadcast intent.

Change-Id: I64124a7892d43f9ad3c0d49f1e63751b88c483dc
2 files changed