Removes a driver specific macro and replaces it with a generic function already
available in Linux.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: robert.richter@amd.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>