Restrict network preferences settings

- Show a restriction message if the malware enforces the network preference settings

- Remove settings search index if the network preference settings is restricted

Bug: 231987122
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=ConfigureWifiSettingsTest

Change-Id: I998aa084d47d556d1eeddcec8c6bb5f1d9a8f6e7
2 files changed