[Intel-gfx] [CI] drm/i915: Disable atomics in L3 for gen9

[J. Bruce Fields]

Would it be possible to apply

	58586680ffad "drm/i915: Disable atomics in L3 for gen9"

to stable kernels?

I'm finding it quite easy to crash my Thinkpad X1 Carbon 6th gen with
Blender on Fedora 34 (which is using the 5.11.y kernels).  It applies
cleanly, and I've been running 5.11.16 with the patch applied and seeing
no obvious ill effects.

--b.