Add logging when timeouts occur

When timeouts occur, add log event messages for debugging.

Change-Id: I140ffd9310651ade3b2735b88a19262d8f85bca5
diff --git a/src/com/android/telecomm/Switchboard.java b/src/com/android/telecomm/Switchboard.java
index 077e605..7587419 100644
--- a/src/com/android/telecomm/Switchboard.java
+++ b/src/com/android/telecomm/Switchboard.java
@@ -337,6 +337,7 @@
         while (iterator.hasNext()) {
             Call call = iterator.next();
             if (call.getAgeInMilliseconds() >= newCallTimeoutMs) {
+                Log.d(TAG, "Call " + call.getId() + " timed out.");
                 mOutgoingCallsManager.abort(call);
                 calls.remove(call);