WifiNetworkSelector: Mark WFA networks as untrusted

Plumb the new WifiConfiguration.trusted flag through the wifi stack.
Only the network configurations created for WFA via
ScoredNetworkEvaluator will be marked untrusted. The rest of the
network configurations are trusted by default.

Bug: 113878056
Test: ./frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Change-Id: Ic49252a2d99f2c7a35251de37e1f3a1843b20da2
6 files changed