From: Ian Campbell <icampbell@arcom.com>

Powering down the PHY saves something like 100mA at 5V on my platform.
Currently it is only done when the interface is brought down but it makes
sense to do it on suspend as well.
Signed-off-by: Ian Campbell <icampbell@arcom.com>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>