x86/iommu: introduce a cache sync hook

x86/iommu: introduce a cache sync hook

The hook is only implemented for VT-d and it uses the already existing
iommu_sync_cache function present in VT-d code. The new hook is
added so that the cache can be flushed by code outside of VT-d when
using shared page tables.

Note that alloc_pgtable_maddr must use the now locally defined
sync_cache function, because IOMMU ops are not yet setup the first
time the function gets called during IOMMU initialization.

No functional change intended.

This is part of XSA-321.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>