Revert "Bluetooth: fix debugfs registration"

This reverts commit e5ae01fd.

It breaks the Android KABI and will be brought back at a later time when
it is safe to do so.

Bug: 161946584
Change-Id: I6638860ea9174a4124df2a24a004d96b9676ce0b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>