Some IOMMUs accept an IOMMU_NOEXEC protection flag in addition to
IOMMU_READ and IOMMU_WRITE. Expose this as an IOMMU capability.
Signed-off-by: NAntonios Motakis <a.motakis@virtualopensystems.com>
Acked-by: NJoerg Roedel <jroedel@suse.de>
Signed-off-by: NWill Deacon <will.deacon@arm.com>