Test/encode/avcenc: Follow the H264 spec to fix wrong SEI parameter setting for CBR HRD

V1->V2: Follow Haihao's comments to add some comments and remove some
magic number.

Signed-off-by: Zhao, Yakui <yakui.zhao@intel.com>
(cherry picked from commit 51901e340cc467a2d562491121e0de38f5a066fe)
1 file changed