Ensure that test BCC are unique per call am: f109fc611d am: d9be766b1c am: 1386140cf4 am: 51a64be7ab

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/1755503

Change-Id: I675e8e1a78b07d6e10540e09fb1de4d4f4084f20