vfio-ccw: step down as maintainer

I currently don't have time to act as vfio-ccw maintainer
anymore, but I trust that I leave it in capable hands.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Eric Farman <farman@linux.ibm.com>
Acked-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Link: https://lore.kernel.org/r/20211006160120.217636-3-cohuck@redhat.com


Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>