[PATCH] VA-API: support Hantro VDE
Hantro VDE engine is already mainlined, but only for Rockchip.
Additional patching for h264 (open MRs, not required):
- libva-v4l2-request  
- libva 
- implement Hantro in DeviceTree (update DONE)
- compile kernel with Hantro support (update DONE)
- test VA-API with mpeg2 video (linaro samples)