vatrace: refine the format of buf data dump
vatrace: refine the format of buf data dump

Signed-off-by: Elaine Wang <2fccf4cf2dd4d5a13e595e1da306b18171affdc0@intel.com>
(cherry picked from commit 2292299fe00036eb6055a84846f63f36cbae27d9)

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