Add Wi-Fi friction icons to AccessPointPreference.

Friction icons are added to the end of the Wi-Fi picker list items to
provide visual information such as whether a network is secured, or saved.
The first two badges added are a lock icon to indicate a secure network, and
an open lock to indicate a saved network that is also secure.

Test: manual inspection
Bug: 34281330
Change-Id: I04ce9bc4a5bd245398d5f3b308ccb30b7cf58270