Refactoring of scan for stored hidden profiles.

Refactoring of scan for stored hidden profiles.

To improve scan performance, when there are hidden profiles stored
in connman and user request for scan, send ScanDone signal after
scanning maximum scan ssids supported by driver instead of sending signal
after scanning all the stored hidden profiles.
Similarly in next scan request, perform scanning (maximum scan ssids) from
remaining hidden profiles and send ScanDone signal.

Change-Id: I6195668c59b0a75bd0e0097ab6e6b7e3d33aae38
Signed-off-by: Niraj Kumar Goit <niraj.g@samsung.com>