Fully qualify android.net.wifi.ScanResult

Somehow the AIDL compiler is confusing
android.net.wifi.ScanResult with
android.bluetooth.le.ScanResult.
For some reason fully qualifying ScanResult
instead of having a single import at the top
fixes the problem.

Bug: 147918827
Test: m ANDROID_BUILDSPEC=vendor/google/build/app_build_spec.mk
Change-Id: I93b9006cb1741ba0d723ffaa8b2a84ff96c7312e