Add a trace constant for PackageManager

Change-Id: Iff63b3d31ba9b997bd61c58c9df5afe2dfd7be7a
diff --git a/include/cutils/trace.h b/include/cutils/trace.h
index e4ed179..6d9b3bc 100644
--- a/include/cutils/trace.h
+++ b/include/cutils/trace.h
@@ -67,7 +67,8 @@
 #define ATRACE_TAG_RS               (1<<15)
 #define ATRACE_TAG_BIONIC           (1<<16)
 #define ATRACE_TAG_POWER            (1<<17)
-#define ATRACE_TAG_LAST             ATRACE_TAG_POWER
+#define ATRACE_TAG_PACKAGE_MANAGER  (1<<18)
+#define ATRACE_TAG_LAST             ATRACE_TAG_PACKAGE_MANAGER
 
 // Reserved for initialization.
 #define ATRACE_TAG_NOT_READY        (1LL<<63)