GPU targets with an MMU-500 attached have a slightly different process for
enabling system cache. Use the compatible string on the IOMMU phandle
to see if an MMU-500 is attached and modify the programming sequence
accordingly.
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>