NFS: FMODE_READ and friends are C macros, not enum types

Address a sparse warning:

  CHECK   fs/nfs/nfstrace.c
fs/nfs/nfstrace.c: note: in included file (through /home/cel/src/linux/rpc-over-tls/include/trace/trace_events.h, /home/cel/src/linux/rpc-over-tls/include/trace/define_trace.h, ...):
fs/nfs/./nfstrace.h:424:1: warning: incorrect type in initializer (different base types)
fs/nfs/./nfstrace.h:424:1:    expected unsigned long eval_value
fs/nfs/./nfstrace.h:424:1:    got restricted fmode_t [usertype]
fs/nfs/./nfstrace.h:425:1: warning: incorrect type in initializer (different base types)
fs/nfs/./nfstrace.h:425:1:    expected unsigned long eval_value
fs/nfs/./nfstrace.h:425:1:    got restricted fmode_t [usertype]
fs/nfs/./nfstrace.h:426:1: warning: incorrect type in initializer (different base types)
fs/nfs/./nfstrace.h:426:1:    expected unsigned long eval_value
fs/nfs/./nfstrace.h:426:1:    got restricted fmode_t [usertype]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfstrace.h

@@ -430,10 +430,6 @@ TRACE_DEFINE_ENUM(O_CLOEXEC);
 		{ O_NOATIME, "O_NOATIME" }, \
 		{ O_CLOEXEC, "O_CLOEXEC" })
 
-TRACE_DEFINE_ENUM(FMODE_READ);
-TRACE_DEFINE_ENUM(FMODE_WRITE);
-TRACE_DEFINE_ENUM(FMODE_EXEC);
-
 #define show_fmode_flags(mode) \
 	__print_flags(mode, "|", \
 		{ ((__force unsigned long)FMODE_READ), "READ" }, \