please add e02f5c1bb228 to v4.9 and later

Please include upstream commit e02f5c1bb2283cfcee68f2f0feddcc06150f13aa

drm: disable uncached DMA optimization for ARM and arm64

into -stable trees v4.9 and later.

It makes the radeon and amdgpu drivers work on ARM and arm64 systems, which are terminally broken currently, and since those are the only architectures affected by this patch, the risk of regressions is low.

Thanks, Ard.