Fixes the following sparse warning:

fs/nfs/callback.c:235:21: warning: symbol 'nfs4_cb_sv_ops' was not
declared. Should it be static?
Signed-off-by: NJason Yan <yanaijie@huawei.com>
Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>