iommu/dma: Always allow DMA-FQ when iommupt provides the iommu_domain

iommupt always supports the semantics required for DMA-FQ, when drivers
are converted to use it they automatically get support.

Detect iommpt directly instead of using IOMMU_CAP_DEFERRED_FLUSH and
remove IOMMU_CAP_DEFERRED_FLUSH from converted drivers.

This will also enable DMA-FQ on RISC-V.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>