Introduce Secretkeeper HAL interface am: 18cafa0a11 am: 5d668c50ec am: 2898897930

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2695089

Change-Id: Ie901b77291416da04067838ad9b5b69d685922d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>