vfio: Rename vfio_reset_bytes_transferred()

vfio: Rename vfio_reset_bytes_transferred()

Enforce a 'vfio_mig_' prefix for the VFIO migration API to better
reflect the namespace these routines belong to.

Reviewed-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20250318095415.670319-3-clg@redhat.com
Link: https://lore.kernel.org/qemu-devel/20250326075122.1299361-3-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>