mwifiex: fix unable to connect hidden SSID AP on DFS channel

We will check if any hidden SSID found in passive scan channels
and do specific SSID active scan for those channels.

Signed-off-by: chunfan chen <jeffc@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>