Force WMM mode when testing TDLS

This ensures that priorites are set in the QoS header as opposed
to the VLAN tag (which ath9k/mac80211 doesn't appear to support).

BUG=chrome-os-partner:30860
TEST=Run this test

Change-Id: I6dddfdc70942ad6b5147c96f86f45e07853ed359
Reviewed-on: https://chromium-review.googlesource.com/209629
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Reviewed-by: Daniel Kim <dekim@broadcom.com>
Tested-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Paul Stewart <pstew@chromium.org>
1 file changed