iommu: fix order of arguments in iommu_map call at iommu_hwdom_init

The order of the page_order and the flags parameters are inverted in
the call to iommu_map made in iommu_hwdom_init.

Fixes: e8afe11 ("iommu: elide flushing for higher order map/unmap operations")
Signed-off-by: Roger Pau Monné <[email protected]>
Reviewed-by: Paul Durrant <[email protected]>
Reviewed-by: Jan Beulich <[email protected]>
Release-acked-by: Juergen Gross <[email protected]>

Author: royger

xen/drivers/passthrough/iommu.c

@@ -202,7 +202,7 @@ void __hwdom_init iommu_hwdom_init(struct domain *d)
                   == PGT_writable_page) )
                 mapping |= IOMMUF_writable;
 
-            ret = iommu_map(d, _dfn(dfn), _mfn(mfn), mapping, 0,
+            ret = iommu_map(d, _dfn(dfn), _mfn(mfn), 0, mapping,
                             &flush_flags);
 
             if ( !rc )