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Adds iommu_connect and disconnect for SMMU support, and configures TBU translation once SMMU has been attached to the display device. Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com> [fixed checking of error code returned by dp_wait_cond() and removed extraneous DRM_ERROR() calls] Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>