xvmc: consolidate put surface interfaces
Make surface list track like context list, and move generic PutSurface code out of i915. So MC driver just needs to fill specific the command params, and we can get one single type of intel xvmc command to issue, ddx driver's put_image_size got removed. Fix last commit with missing XvMCContext assignment. Fix priv_data free with apropriate X11 XFree.
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