Add render layer structure misc parameter in libmix

BZ: 186811

Due to libva interface change, libmix should render
layer structure misc parameter before encode.

Change-Id: I28c2e5c9c283ff8b7f6f3ef7feec0e8383c0f7c3
Signed-off-by: bolunliu <bolun.liu@intel.com>
2 files changed