[Wi-Fi] Update android R strings

For these features:
1. No user certificate for WPA-Enterprise 192-bit
2. Apps to add saved networks
3. Disconnect network

Bug: 149070448
Bug: 149069854
Bug: 148281247
Test: manual visual
Change-Id: I8ad9741446c93bd75142c612c6ca67a57f2cf9e2