iommu-fixes-v5.3-rc1

Including:

	- Revert an Intel VT-d patch that caused boot problems on some
	  machines

	- Fix AMD IOMMU interrupts with x2apic enabled

	- Fix a potential crash when Intel VT-d domain allocation fails

	- Fix crash in Intel VT-d driver when accessing a domain without
	  a flush queue

	- Formatting fix for new Intel VT-d debugfs code

	- Fix for use-after-free bug in IOVA code

	- Fix for a NULL-pointer dereference in Intel VT-d driver when
	  PCI hotplug is used

	- Compilation fix for one of the previous fixes