MAINTAINERS: Update s390-iommu driver maintainer information

The s390 DMA API conversion changes currently under review will extend
the use of the s390-iommu driver to the DMA API. With s390's mandatory
use of an IOMMU this means all DMA for PCI devices will then use the
s390-iommu driver. With this in mind and considering my involvement in
these changes it makes sense to reflect this increased interdependence
in the maintainer structure. Thus add myself as first maintainer and
move Gerald to reviewer status.

Reviewed-by: Gerald Schaefer <[email protected]>
Reviewed-by: Matthew Rosato <[email protected]>
Acked-by: Peter Oberparleiter <[email protected]>
Signed-off-by: Niklas Schnelle <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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