iommu/new-boot: Make intel_iommu cases about scalable mode explicit

Make the intel_iommu iommu/new-boot test cases explicit about whether they are enabling or disabling scalable mode support. There is a kernel config option that changes whether the support is enabled by default, which is going to be enabled soon in ARK and RHEL, so by being explicit here with passing sm_on and sm_off to intel_iommu= it will avoid issues around whether a kernel was built with kernel config option set or not.

Signed-off-by: Jerry Snitselaar jsnitsel@redhat.com