Add call event logging to telecom.

This code saves the last 5 calls and prints out all the call-related
events when doing a "dumpsys telecom".  This includes dumping all
information about the last 5 calls so that bug reports always contain
information about the calls.

Bug: 18923652

Change-Id: I4dbdea32ba4eea3b3a4158fbae99649dc045cd62
diff --git a/src/com/android/server/telecom/CallsManager.java b/src/com/android/server/telecom/CallsManager.java
index 0d57c8a..cc1143a 100644
--- a/src/com/android/server/telecom/CallsManager.java
+++ b/src/com/android/server/telecom/CallsManager.java
@@ -1200,6 +1200,8 @@
             shouldNotify = true;
         }
 
+        call.destroy();
+
         // Only broadcast changes for calls that are being tracked.
         if (shouldNotify) {
             for (CallsManagerListener listener : mListeners) {