move event log tags used by ActivityManager into this package

We can now locate event log tag definitions in individual packages
(and java constants for the tag numbers get auto-generated), so move
all the tags used by the system server into the package.
diff --git a/services/java/Android.mk b/services/java/Android.mk
index 5c54e33..934712c 100644
--- a/services/java/Android.mk
+++ b/services/java/Android.mk
@@ -6,7 +6,8 @@
 
 LOCAL_SRC_FILES := \
             $(call all-subdir-java-files) \
-	    com/android/server/EventLogTags.logtags
+	    com/android/server/EventLogTags.logtags \
+	    com/android/server/am/EventLogTags.logtags
 
 LOCAL_MODULE:= services