NFSD: Remove definition for trace_nfsd_file_gc_recent
Event nfsd_file_gc_recent was added by commit 64912122a4f8 ("nfsd:
filecache: introduce NFSD_FILE_RECENT") but never used.
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Closes: https://lore.kernel.org/linux-nfs/5ccae2f9-1560-4ac5-b506-b235ed4e4f4f@oracle.com/T/#t
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>