Lazy initialize bcc_ and devicePrivKey_ am: b522d8d9ab am: e2b6ab4de0 am: 56042e9ca6 am: 89d8700d49

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/1976866

Change-Id: I81c954fe6da5286954be7609ae6f8d773fb1ba88