do not mount the debugfs on userdebug builds am: d5f885d7ce

Original change: https://googleplex-android-review.googlesource.com/c/device/google/zuma/+/24185624

Change-Id: If0c2665d93edb212a9b65578e4a73dc0432c734a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>