Fix crash for incoming call

When starting an Activity from a Service, the Intent needs to have
FLAG_ACTIVITY_NEW_TASK set.

Change-Id: I95a3848fcac73d72c9bd179f96468c60e8de5ff3
diff --git a/src/com/android/services/telephony/IncomingCallNotifier.java b/src/com/android/services/telephony/IncomingCallNotifier.java
index 5121dcf..d99f10d 100644
--- a/src/com/android/services/telephony/IncomingCallNotifier.java
+++ b/src/com/android/services/telephony/IncomingCallNotifier.java
@@ -114,6 +114,7 @@
         builder.setNetworkType(CallServiceDescriptor.FLAG_PSTN);
 
         Intent intent = new Intent(TelecommConstants.ACTION_INCOMING_CALL);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         intent.putExtra(TelecommConstants.EXTRA_CALL_SERVICE_DESCRIPTOR, builder.build());
 
         if (DBG) {