Introduce Secretkeeper HAL interface am: 18cafa0a11 am: 691cff2628 am: faa4895590

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

Change-Id: I189de62823c3af6d75663a85169ef5a615164a6e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>