Add AuthProxy to authorization_set.h

Keymaster often queries the both sw and hw enforced authorization lists.
The AuthProxy allows to wrap two authorization lists into a singe proxy
objects that forward quarries to both wrapped lists and allows iterating
through the content of both as if they where a single authorization
list.

Test: VtsHalKeymasterV3_0TargetTest
Bug: 67358942
Change-Id: I0346461c4c92d48d342dd66c84024f1a65837002
3 files changed