audioserver: log system event for binder timeouts

Add event logging in case of audioserver watchdog to help
collect statistics.

Test: make. Simulate watchdog and check events in logcat.

Change-Id: I4716852c77d56703ad5f3dfc2500f598a2b80a12
diff --git a/media/libaudioclient/IAudioFlinger.cpp b/media/libaudioclient/IAudioFlinger.cpp
index 37c62a8..84e8bee 100644
--- a/media/libaudioclient/IAudioFlinger.cpp
+++ b/media/libaudioclient/IAudioFlinger.cpp
@@ -949,7 +949,8 @@
             break;
     }
 
-    TimeCheck check("IAudioFlinger");
+    std::string tag("IAudioFlinger command " + std::to_string(code));
+    TimeCheck check(tag.c_str());
 
     switch (code) {
         case CREATE_TRACK: {