Revert "Revert "Add neverallows for debugfs access""

This reverts commit e95e0ec0a5f2f6fdf362d14b7960850a05e790b5.

Now that b/186727553 is fixed, it should be safe to revert this revert.

Test: build
Bug: 184381659
Change-Id: Ibea3882296db880f5cafe4f9efa36d79a183c8a1
diff --git a/private/storaged.te b/private/storaged.te
index b7d4ae9..bb39e5b 100644
--- a/private/storaged.te
+++ b/private/storaged.te
@@ -18,10 +18,12 @@
 allow storaged storaged_data_file:dir rw_dir_perms;
 allow storaged storaged_data_file:file create_file_perms;
 
-userdebug_or_eng(`
-  # Read access to debugfs
-  allow storaged debugfs_mmc:dir search;
-  allow storaged debugfs_mmc:file r_file_perms;
+no_debugfs_restriction(`
+  userdebug_or_eng(`
+    # Read access to debugfs
+    allow storaged debugfs_mmc:dir search;
+    allow storaged debugfs_mmc:file r_file_perms;
+  ')
 ')
 
 # Needed to provide debug dump output via dumpsys pipes.