memory: Add permissions in IOMMUAccessFlags

memory: Add permissions in IOMMUAccessFlags

This will be necessary for devices implementing ATS.
We also define a new macro IOMMU_ACCESS_FLAG_FULL in addition to
IOMMU_ACCESS_FLAG to support more access flags.
IOMMU_ACCESS_FLAG is kept for convenience and backward compatibility.

Here are the flags added (defined by the PCIe 5 specification) :
    - Execute Requested
    - Privileged Mode Requested
    - Global
    - Untranslated Only

IOMMU_ACCESS_FLAG sets the additional flags to 0

Signed-off-by: Clement Mathieu--Drif <clement.mathieu--drif@eviden.com>
Message-Id: <20250628180226.133285-3-clement.mathieu--drif@eviden.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>