Revert "WifiManager: Return status from startScan()"

This reverts commit b81c3d5f9a86e4e1f90be2ffaa81ea5df8fce684.

Bug: 77297012
Change-Id: Ie8727343650b549d4f438643d50a10fe50ab52b1
Reason: this change is breaking the build
3 files changed