vatrace: add IVF header for VP8 coded buffer dump
vatrace: add IVF header for VP8 coded buffer dump

Signed-off-by: Austin Yuan <f447c34e4ebcef84a81b40a8d4dbc448a14e5570@intel.com>

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