Add functionality to Keystore 2.0 database module.

This patch adds the following functionality:
 * Add the perboot grant table along with grant and ungrant
   API.
 * Add the persistent blobentry table along with API
   to add and load blob components.
 * Tests for the new API surface.

Authoship note:
This patch has joined authorship by jgalenson@google.com
and jdanis@google.com

Bug: 159370859
Test: keystore2_test
Change-Id: Ie1c6bcfb0718b7fa6ea850697b43f7d4527b3e87
1 file changed