intel: add local memory support for DG1
This MR adds local memory support for DG1.
It requires kernel changes that are not yet merged. (https://lists.freedesktop.org/archives/intel-gfx/2020-July/244053.html) The commits that change drm-uapi are currently marked with !UPSTREAM
.
Ref: !4956 (merged)
Edited by Faith Ekstrand