[PATCH] bcm43xx: basic ethtool support

This patch contains the beginnings of ethtool support for bcm43xx.

It only implements get_drvinfo and get_link, but that's enough for
ifplugd to use ethtool to know whether we're associated or not and then
start or stop dhcp as necessary.

Signed-off-by: Jason Lunz <lunz@falooley.org>
Signed-off-by: Michael Buesch <mbuesch@freenet.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>