spidernet: spidernet: add support for Celleb

This patch adds or changes some HW specific settings for spider_net on
Celleb.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>