exec: revert MemoryRegionCache
MemoryRegionCache did not know about virtio support for IOMMUs (because the
two features were developed at the same time). Revert MemoryRegionCache
to "normal" address_space_* operations for 2.9, as it is simpler than
undoing the virtio patches.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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