Update credential removal strings

1) Credential can no longer be removed for separate challenge profiles,
   so strings and supporting logic are also now removed
2) Updates existing strings for credential and fingerprint
3) Adds new strings for face
4) Adds new strings for face + fingerprint

Bug: 185180691
Test: manual on device

Change-Id: I2a850eb6644103e14ef2a670222e500c705a16cd