softmac: MAINTAINERS update

This patch marks softmac as obsolete in MAINTAINERS and removes Joe and
myself as maintainers, we're no longer using it nor interested in the
code in any way. Also remove the website reference because I took it
offline. Hopefully the code will go away in 2.6.25.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Joseph Jezak <josejx@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>