anv/pipeline: Fix MEDIA_VFE_STATE::PerThreadScratchSpace on gen7
We were always programming it with the Broadwell convention which is too large by a factor of two on Haswell and just plain wrong on IVB and BYT.
We were always programming it with the Broadwell convention which is too large by a factor of two on Haswell and just plain wrong on IVB and BYT.