staging: vt6655: remove multiple instances of driver loading.

The driver can only load once from the instance provided
by pci_dev.

struct vnt_private next, prev and pDevice_Infos are removed.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>