Revert "tracing: Have trace_event_file have ref counters"

This reverts commit a98172e3 which is
commit bb32500f upstream.

It breaks the current Android ABI, and if needed, can be brought back in
an abi-safe way in the future.

Bug: 161946584
Change-Id: If981a67442122352b1836c6e75ba2a462cbc731d
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>