KVM: s390: move some gmap shadowing functions away from mm/gmap.c

KVM: s390: move some gmap shadowing functions away from mm/gmap.c

Move some gmap shadowing functions from mm/gmap.c to kvm/kvm-s390.c and
the newly created kvm/gmap-vsie.c

This is a step toward removing gmap from mm.

Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Link: https://lore.kernel.org/r/20250123144627.312456-10-imbrenda@linux.ibm.com
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20250123144627.312456-10-imbrenda@linux.ibm.com>