arm/arm64: ITS: migration tests

This test maps LPIs (populates the device table, the collection table,
interrupt translation tables, configuration table), migrates and make
sure the translation is correct on the destination.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
[ Complete migration even when the test is skipped. Otherwise the
  migration scripts hang. ]
Signed-off-by: Andrew Jones <drjones@redhat.com>