test/decode/tinyjpeg: create VA surface with right render target format

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
Reviewed-by: Beauchesne, Gwenole <gwenole.beauchesne@intel.com>
(cherry picked from commit 54f686f4a371bf34007ce1ff70e7b74cd9986ad7)