This flag is used by system server to mark keys used during the
synthetic password auth flow. keys marked with this flag will not
be super encrypted because super encryption requires knowledge of
the synthetic password, causing a chicken-and-egg problem.
Bug: 35849499
Bug: 34600579
Test: cts-tradefed run cts-dev -m CtsDevicePolicyManagerTestCases -t com.android.cts.devicepolicy.MixedProfileOwnerTest#testResetPasswordWithToken
Change-Id: I474822f2e026f24ce6f6de1aa58b5012922f7b13
12b644d275