identity: Add support for ECDSA auth and don't require session encryption.

This change uses new API in Identity Credential HAL version 5 and
later to obtain the mdoc ECDSA authentication signature and pass it to
the framework API.

Bug: 241912421
Test: atest VtsHalIdentityTargetTest
Test: atest android.security.identity.cts
Change-Id: I4bb8ba8c4a46a91791af9e0e48c81894d896a2d0
2 files changed