libva: at 2.16 the driver mapping mechanism changed, deprecating this helper.

more details at:

• https://github.com/intel/libva/commit/f5639d3916a52d34eb0584ec2789d8496f540e7c
• https://github.com/intel/libva/commit/317c0fbea5405a27bf58505a6bc6b1f6414beb71