[PATCH] mv643xx_eth: Fix spinlock recursion bug

This patch eliminates a spinlock recursion bug introduced recently.
Since eth_port_send() is always called with the lock held, we simply
remove the locking inside the function itself.

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