Ensure that test BCC are unique per call

If test mode BCC are repeatable, then the test CSR API becomes a
unique device id.

Ignore-AOSP-First: No merge path to AOSP, will manually port.
Bug: 192687735
Test: VtsHalRemotelyProvisionedComponentTargetTest
Change-Id: I85888173c7cfbcd26287a0258917e04b0ace0888
4 files changed