test/encode/avcenc: Fix bug of ignoring QP value
test/encode/avcenc: Fix bug of ignoring QP value

Signed-off-by: Hai Lan <c39d70705e4b9e52aa2c8b5db2ca404f5a05ebd5@intel.com>

01org/iotg-lin-gfx-libva,01org/iotg-lin-gfx-libva,01org/libva-cros,gbeauchesne/libva,01org/libva-cros,gbeauchesne/libva,01org/libva-cros,pma1/libva,01org/iotg-lin-gfx-libva,chenxianqin/vaapi-libva,pma1/libva,chenxianqin/vaapi-libva,zzhhui/libva,chenxianqin/vaapi-libva,gbeauchesne/libva,zzhhui/libva,pma1/libva,zzhhui/libva