Expose ScanResult/WifiInfo @hide APIs as @SystemApi

Expose @hide APIs in ScanResult/WifiInfo as @SystemApi.
These APIs are mostly used by Settings.

Bug: 144311098
Test: atest FrameworksWifiApiTests
Change-Id: Ifdfa78ed59f6a42a3646defa5a9f164d146ceada
9 files changed