configure: make clear that VirtFS is 9p

Add '9P' to the summary output section of 'VirtFS' to avoid being
confused with virtiofs.

Based-on: <20230503130757.863824-1-pefoley@google.com>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <E1px7Id-0000NE-OQ@lizzy.crudebyte.com>
1 file changed