memory: tune last param of iommu_ops.translate()

memory: tune last param of iommu_ops.translate()

This patch converts the old "is_write" bool into IOMMUAccessFlags. The
difference is that "is_write" can only express either read/write, but
sometimes what we really want is "none" here (neither read nor write).
Replay is an good example - during replay, we should not check any RW
permission bits since thats not an actual IO at all.

CC: Paolo Bonzini <[email protected]>
CC: David Gibson <[email protected]>
Reviewed-by: David Gibson <[email protected]>
Acked-by: David Gibson <[email protected]>
Acked-by: Paolo Bonzini <[email protected]>
Signed-off-by: Peter Xu <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Reviewed-by: Jason Wang <[email protected]>