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

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

Change-Id: I92b0f5605a4c250b388d503beb78eb04d78605d9