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
Bug: 177830239
Bug: 177791435
Bug: 177787061
Bug: 177787180
Test: VTS test
Change-Id: I9f0adc97efadd0fa1a1f16dd5ec811f4151a2b03