Integrate IKeystoreAuthorization aidl's addAuthToken with Keystore SPI.

This CL introduces the Keystore SPI class for IKeystoreAuthorization
aidl interface and implements the calling code for addAuthToken method.

Bug: 166672367
Test: VTS test
Change-Id: I7893ab4520b16533b9fddc9909297856e0b523ae
4 files changed