ufs: restore name cache fast path lookup

Found by: dchagin
Fixes: f3c81b973897 ("ufs: add missing vop_fplookup ops")
Approved by: re (gjb)
(cherry picked from commit a87c6962affc2d1994d8f30806c934eb4cb7af22)
(cherry picked from commit 25d8cf225ac29bb450bf52866aa6d169b9193178)