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

This reverts commit bef13ac26de200570a6b5cfc1c679a54f5c436cb.

Reason for revert: Compilation failure in Arc++ fixed.
Bug: 77297012

Change-Id: I6a999541b3c01af24cf6a0961144c35d16139d9e
2 files changed