Revert "FROMLIST: drm/msm/iommu: rename msm_fault_handler to msm_gpu_fault_handler"

This reverts commit 2aaacf90dd22f7f991d0a2e1da99ef800046737c.

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: Ia5a670dd8b16cdf4e1ed2288810fb40273b33100
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5925932


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