Keystore 2.0: Delete unencrypted boot level keys.

This patch uses the database versioning mechanism to delete boot level
bound keys that have been generated before cryptographic binding to the
boot level was implemented.

Ignore-AOSP-First: No automerge path from AOSP.
Bug: 187862706
Test: keystore2_test
Change-Id: I34999d7633e4ef17205b055e11751f0498ae6932
1 file changed