iommu-fixes-v5.3-rc7

Including:

	* Revert for an Intel VT-d patch that caused problems for some
	  users.

	* Removal of a feature in the Intel VT-d driver that was never
	  supported in hardware. This qualifies as a fix because the
	  code for this feature sets reserved bits in the invalidation
	  queue descriptor, causing failed invalidations on real
	  hardware.

	* Two fixes for AMD IOMMU driver to fix a race condition and to
	  add a missing IOTLB flush when kernel is booted in kdump mode.