Back port "scan_freq" implementation to wpa supplicant 0.6.x

[Johannes Berg]

On Wed, 2010-12-15 at 19:03 -0600, Dan Williams wrote:

> I thought that too, then I checked :)  WEXT has the facility to scan for
> specific channels, but no in-kernel drivers implement that
> functionality.  Of course, since it's channels and not band/freq pairs
> it's completely broken too.

You're right. And indeed now that you mention it -- it is even
implemented in cfg80211's wext code.

johannes