intel-iommu: trace domain id during page walk
    
    This patch only modifies the trace points.
    
    Previously we were tracing page walk levels.  They are redundant since
    we have page mask (size) already.  Now we trace something much more
    useful which is the domain ID of the page walking.  That can be very
    useful when we trace more than one devices on the same system, so that
    we can know which map is for which domain.
    
    CC: QEMU Stable <qemu-stable@nongnu.org>
    Signed-off-by: Peter Xu <peterx@redhat.com>
    Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
    (cherry picked from commit d118c06ebbee2d23ddf873cae4a809311aa61310)
    Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>