NFSD: Remove definitions for unused trace_nfsd_file_lru trace points

Events nfsd_file_lru_add_disposed and nfsd_file_lru_del_disposed
were added by commit 4a0e73e ("NFSD: Leave open files out of
the filecache LRU") but they were 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>

Author: chucklever

fs/nfsd/trace.h

@@ -1343,9 +1343,7 @@ DEFINE_EVENT(nfsd_file_gc_class, name,					\
 	TP_ARGS(nf))
 
 DEFINE_NFSD_FILE_GC_EVENT(nfsd_file_lru_add);
-DEFINE_NFSD_FILE_GC_EVENT(nfsd_file_lru_add_disposed);
 DEFINE_NFSD_FILE_GC_EVENT(nfsd_file_lru_del);
-DEFINE_NFSD_FILE_GC_EVENT(nfsd_file_lru_del_disposed);
 DEFINE_NFSD_FILE_GC_EVENT(nfsd_file_gc_in_use);
 DEFINE_NFSD_FILE_GC_EVENT(nfsd_file_gc_writeback);
 DEFINE_NFSD_FILE_GC_EVENT(nfsd_file_gc_referenced);