Add mlstrustedobject to tombstone_data_file.

Bug: http://b/30705528
Bug: http://b/34450704
Test: mma
Change-Id: I315a52411232b6ff38d014a2e0fadb0bcfbc1f3f

public/file.te

@@ -95,7 +95,7 @@ type adb_data_file, file_type, data_file_type;
 # /data/anr - ANR traces
 type anr_data_file, file_type, data_file_type, mlstrustedobject;
 # /data/tombstones - core dumps
-type tombstone_data_file, file_type, data_file_type;
+type tombstone_data_file, file_type, data_file_type, mlstrustedobject;
 # /data/app - user-installed apps
 type apk_data_file, file_type, data_file_type;
 type apk_tmp_file, file_type, data_file_type, mlstrustedobject;