libdm: Redact keys from dm-crypt targets when calling GetTable. am: c434d801

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/29655996



Change-Id: I8cfb7d9e5fb532e4d36a961e1ebad9595fdb9a95
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>