Move/rename stats_enums.proto's directory/name

Migrate stats_enums.proto to core/proto/android/stats/ directory for the
consistency with other enums file imported in atoms.proto

Test: mma
Change-Id: I79f068889ac5c34c6fd8c5966687669efb37d180
diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index 9d83afd..cb8a71c 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -29,8 +29,8 @@
 import "frameworks/base/core/proto/android/telecomm/enums.proto";
 import "frameworks/base/core/proto/android/telephony/enums.proto";
 import "frameworks/base/core/proto/android/view/enums.proto";
-import "frameworks/base/proto/src/stats_enums.proto";
 import "frameworks/base/core/proto/android/service/procstats.proto";
+import "frameworks/base/core/proto/android/stats/enums.proto";
 import "frameworks/base/core/proto/android/internal/powerprofile.proto";
 
 /**
@@ -1923,7 +1923,7 @@
     optional int32 uid = 1 [(is_uid) = true];
 
     // An event_id indicates the type of event.
-    optional android.os.statsd.EventType event_id = 2;
+    optional android.stats.EventType event_id = 2;
 }
 
 /**
@@ -2675,4 +2675,4 @@
  */
 message PowerProfile {
     optional com.android.internal.os.PowerProfileProto power_profile_proto = 1;
-}
\ No newline at end of file
+}