CHROMIUM: hostapd: Add option to send OBSS scan params

Add a parameter to send the overlapping BSS scan parameter
information element.  This will require clients to perform
background scans to check for neigbors overlapping this
HT40 BSS.  Since the implementation is incomplete it should
only be used for testing.

BUG=chrome-os-partner:22474
TEST=Packet capture of AP running with this parameter set

Change-Id: If970d6e899edc7621fb72fa1827fddfdcf122f80
Reviewed-on: https://chromium-review.googlesource.com/167975
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Paul Stewart <pstew@chromium.org>
5 files changed