Bring up monitor interface first before setting the frequency.

This is needed for configuring monitor interface on a WP2 device, where
the driver would throw an error when trying to set the frequency on an
interface that's not up yet.

BUG=chrome-os-partner:32215
TEST=Verify network_WiFi_SimpleConnect.wifi_check11g passes on both
     stumpy and panther APs.

Change-Id: I6936c6ad02a77de80e39b21b129c1db11ac94509
Reviewed-on: https://chromium-review.googlesource.com/219554
Tested-by: Peter Qiu <zqiu@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Peter Qiu <zqiu@chromium.org>
1 file changed