iommu: Remove useless flush from iommu_create_device_direct_mappings()

These days iommu_map() does not require external flushing, it always
internally handles any required flushes. Since
iommu_create_device_direct_mappings() only calls iommu_map(), remove
the extra call.

Since this is the last call site for iommu_flush_iotlb_all() remove it
too.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/0-v1-bb6c694e1b07+a29e1-iommu_no_flush_all_jgg@nvidia.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>