[PATCH] mv643xx_eth: Update dev->last_rx on packet receive

Update dev->last_rx on packet receive

This fix corrects errors seen during configuration of the bonding driver.

Signed-off-by: Paolo Galtieri <pgaltieri@mvista.com>
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>