identity: Make NoS libeic and AOSP libeic align

1. Add input parameter buffer size for CBOR data encoding
   because Nugget OS protobuf buffer is not null terminated.
2. Modify some libeic APIs to align with NoS libeic.

Bug: 198403263
Test: atest VtsHalIdentityTargetTest
      atest android.security.identity.cts
Change-Id: I9bc3689da2571c0925972f33b7314cbaaad0e28d