Keystore 2.0: Make Bluetooth app ready for Keystore 2.0 part 2.

No more specifying UIDs for Keystore. Bluetooth is running as
AID_BLUETOOTH, so it is using this namespace implicitly.

Bug: 181841596
Bug: 159476193
Test: Successfully pair new device.
Change-Id: I966325fbe77dd6c0fc128f08bc98245d86927212