Revert "tracing: Have trace_event_file have ref counters"

This reverts commit 961c4511 which is
commit bb32500f upstream.

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

Bug: 161946584
Change-Id: Id5da117def3da9c182501e30ee84bea05da7e492
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>