UPSTREAM: iommu: Map reserved memory as cacheable if device is coherent

Check if the device is marked as DMA coherent in the DT and if so,
map its reserved memory as cacheable in the IOMMU.
This fixes the recently added IOMMU reserved memory support which
uses IOMMU_RESV_DIRECT without properly building the PROT for the
mapping.

Bug: 254441685
Fixes: a5bf3cfc ("iommu: Implement of_iommu_get_resv_regions()")
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230926152600.8749-1-laurentiu.tudor@nxp.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>
(cherry picked from commit f1aad9df)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Ic6738822da32e134af9dd3ed5737e611dffe85c9