i915: allow linear mapping for P010 scanout

Same as NV12, but more restricted. This will unbreak plane_test
as used in Tast PlatformOverlays.24bpp_p010_overlay, which is
currently broken because P010 BOs are tried to be mappe in
userspace.

BUG=b:226417611
TEST=plane_test --format XR24 --plane P010 --size 640x360 on brya

Change-Id: Ifb7b38435bcb3ff6d911a7671a01598f0ec45f87
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/4459793
Reviewed-by: Dominik Behr <[email protected]>
Commit-Queue: Dominik Behr <[email protected]>
Tested-by: Miguel Casas-Sanchez <[email protected]>
Auto-Submit: Miguel Casas-Sanchez <[email protected]>
Reviewed-by: Hang Nguyen <[email protected]>
1 file changed