iommu-updates-v4.17

These updates come with:

	- OF_IOMMU support for the Rockchip iommu driver so that it can
	  use generic DT bindings

	- Rework of locking in the AMD IOMMU interrupt remapping code to
	  make it work better in RT kernels

	- Support for improved iotlb flushing in the AMD IOMMU driver

	- Support for 52-bit physical and virtual addressing in the
	  ARM-SMMU

	- Various other small fixes and cleanups