qcacmn: Set hidden ssid flag in vdev restart for SAP CSA scenario

SAP configured in hidden ssid mode sends probe response to
BC probe requests after force SCC. In send_vdev_start_cmd_tlv,
triggered as part of set_channel on SAP interface, host does not
set the hidden_ssid flag in vdev_restart scenario which results
in the aforementioned behavior.

Fix is to set the hidden ssid flag in vdev_restart scenario
as well for channel switch on SAP interface.

Change-Id: I6c8126f6df05b8794a89690a6fe320be1f02c356
CRs-Fixed: 2442872