vatrace: dump flags of VAPictureH264
vatrace: dump flags of VAPictureH264

Signed-off-by: Elaine Wang <2fccf4cf2dd4d5a13e595e1da306b18171affdc0@intel.com>
(cherry picked from commit e1d86f000749d5fdbd6e36b55260d3fae096e457)

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