This adds the API methods and values for keyguard-bound keys, but
contains none of the actual functionality.
Test: CTS tests in CtsKeystoreTestCases
Bug: 67752510
Merged-In: Iccd7dafd77258d903d11353e02ba3ab956050c40
Change-Id: Iccd7dafd77258d903d11353e02ba3ab956050c40
(cherry picked from commit fd75c7232a)