ath5k: Use our own Kconfig file, we'll be expanding this shortly

Apologoes, this is a re-post of patch-04, forgot to git-add
our Kconfig... New series (only 2 patches needed fixing, which
I am reposting) can be found here:

http://kernel.org/pub/linux/kernel/people/mcgrof/patches/ath5k/2008-02-04.v2/

Use our own Kconfig file, we'll be expanding this shortly.

Signed-off-by: Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>