Revert "tracing: Have trace_event_file have ref counters"

This reverts commit cbc7c29d which is
commit bb32500f upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ibe8c85403cda0e808e3921d947bd3d0201da521a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>