ts108: use netdev_alloc_skb

Use netdev_alloc_skb for rx buffer allocation. This sets skb->dev
and can be overriden for NUMA machines.

This device is PowerPC only, so not tested or compiled.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>