Revert "FROMLIST: drm/msm: switch msm_kms to use msm_iommu_disp_new()"

This reverts commit a8056e2f1a3b03e742c89c989213f39a2f952106.

Revert because:
* We've gathered the info we needed for now.
* Progress has stalled getting these upstream.
* The gathering of the devcoredumps is causing a big allocation which
  sometimes fails / causes a crash.

BUG=b:372769248, b:353315351
TEST=CQ

Change-Id: I8c66c0627f899259371a863f8398a1f28ae5f98f
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5925930


Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Hubert Mazur <hmazur@google.com>
Signed-off-by: Tomasz Nowicki <tnowicki@google.com>