wl12xx: check for ROC on scan_complete

When scan completes, and we are not associated, we should start
the dev role and ROC. however, we might already be in this situation
(e.g. if we got disconnected during scan). check for it.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>