IOMMU_CAP_INTR_REMAP has been advertised in arm-smmu(-v3) although
on ARM this property is not attached to the IOMMU but rather is
implemented in the MSI controller (GICv3 ITS).

Now vfio_iommu_type1 takes into account the MSI domain MSI remapping
capability, let's correct this.

Signed-off-by: Eric Auger <eric.auger@redhat.com>