Fix warning: "/*" within comment

Signed-off-by: Austin Yuan <shengquan.yuan@intel.com>
vp8 dec: refine va_dec_vp8.h

add clear notation for: key_frame/VABoolCoderContextVPX.count/num_of_partitions/partition_size[0]
remove mb_skip_coeff since it can be deduced from mb_no_coeff_skip if it is required

Signed-off-by: Zhao, Halley <halley.zhao@intel.com>
add num_mb field to VASurfaceDecodeMBErrors reporting structure.
Libva chroma siting DDI support updated 0.2
Add NV21 format for render target
vp8 dec: add clear notation for qindex

Signed-off-by: Zhong Li <zhong.li@intel.com>