Add `ISecretkeeper::getAuthGraphKe()` method to the Secretkeeper HAL.
Align the AIDL targets between AuthGraph and Secretkeeper, and add
some defaults that automatically link to the current version of the
Secretkeeper AIDL targets.
Move the non-secure implementation of AuthGraph to run the TA in a
separate thread.
Alter the nonsecure implementation of Secretkeeper so that it no longer
directly implements Secretkeeper functionality, but instead re-uses
common code from the Secretkeeper reference implementation. This
involves re-using the common implementation of the HAL service (from
`authgraph_hal`), but also involves using the reference implementation
of the the TA code that would normally run in a separate secure
environment. The latter code expects to run in a single-threaded
environment, so run it in a single local thread.
Note that the negotiated session keys emitted by AuthGraph are not yet
used by Secretkeeper (coming in a subsequent CL).
Extend the Secretkeeper VTS tests to invoke the AuthGraph VTS inner
tests on the returned IAuthGraphKeyExchange instance, exercising the
instance as an AuthGraph sink.
Bug: 291228560
Test: VtsSecretkeeperTargetTest
Change-Id: Ia2c97976edc4530b2c902d95a74f3c340d342174
