Add support for TAG_TRUSTED_CONFIRMATION_REQUIRED.

Since checking the confirmation token requires access to a secret key
provided by the implementation, we'll add a new virtual method to
KeymasterContext for doing this.

Bug: 181068615
Test: CtsVerifier on Trusty.
Change-Id: Ic98eda11027f3094727aa2dafc2c1c42a21b41aa
5 files changed