libdm: Redact keys from dm-crypt targets when calling GetTable. am: c434d801 am: 8dce05a1

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



Change-Id: I048018ab5632f0be827e17f5c65cee0d3b36cec3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>