nfsd: Add "nfsd_" to trace point names

Follow naming convention used in client and in sunrpc layers.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 40dfb75..792fbb8 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1411,7 +1411,7 @@ nfsd4_layoutget(struct svc_rqst *rqstp,
 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
 						true, lgp->lg_layout_type, &ls);
 	if (nfserr) {
-		trace_layout_get_lookup_fail(&lgp->lg_sid);
+		trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
 		goto out;
 	}
 
@@ -1480,7 +1480,7 @@ nfsd4_layoutcommit(struct svc_rqst *rqstp,
 						false, lcp->lc_layout_type,
 						&ls);
 	if (nfserr) {
-		trace_layout_commit_lookup_fail(&lcp->lc_sid);
+		trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
 		/* fixup error code as per RFC5661 */
 		if (nfserr == nfserr_bad_stateid)
 			nfserr = nfserr_badlayout;