test/encode/avcenc: Fixed bug about B frame display order wrong.
test/encode/avcenc: Fixed bug about B frame display order wrong.

Signed-off-by: Zhou Chang <51ad061729f5418fbf57d7f4d13e3e85573c85d5@intel.com>

halleyzhao/libva-fdo,android-ia/hardware_intel_libva,CyanogenMod/android_hardware_intel_libva,android-ia/hardware_intel_libva,halleyzhao/libva-fdo,android-ia/hardware_intel_libva,halleyzhao/libva-fdo,CyanogenMod/android_hardware_intel_libva,CyanogenMod/android_hardware_intel_libva