MAINTAINERS: Add entry VFIO based Mediated device drivers

Adding myself as a maintainer of mediated device framework,
a sub module of VFIO.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Neo Jia <cjia@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>