Revert "Revert "WifiManager: Return status from startScan()""

This reverts commit 4c36c2903d85a829efcc0ecaf2a67d0d05fcb967.

Reason for revert: Compilation failure in Arc++ fixed.
Bug: 77297012
Change-Id: Ic707f7256e8d7430c28e58085c6c2208f88042f2
3 files changed