vfio/common: Move dirty tracking ranges update to helper

vfio/common: Move dirty tracking ranges update to helper

Separate the changes that update the ranges from the listener, to
make it reusable in preparation to expand its use to vIOMMU support.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
[ clg: - Rebased on upstream
       - Introduced vfio_dirty_tracking_update_range()
       - Fixed typ in commit log ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>