Mark debugfs type with debugfs_type attribute

Test: build policy
Change-Id: If13838e8da6e3fe14bb5c7c7ade6f8ac0d5d1982

public/file.te

@@ -64,7 +64,7 @@ type mqueue, fs_type;
 type fuse, sdcard_type, fs_type, mlstrustedobject;
 type sdcardfs, sdcard_type, fs_type, mlstrustedobject;
 type vfat, sdcard_type, fs_type, mlstrustedobject;
-type debugfs, fs_type;
+type debugfs, fs_type, debugfs_type;
 type debugfs_mmc, fs_type, debugfs_type;
 type debugfs_trace_marker, fs_type, debugfs_type, mlstrustedobject;
 type debugfs_tracing, fs_type, debugfs_type;