Merge "Add @hide to the keymaster interfaces" am: 1497fc86e0

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2277929

Change-Id: I83d87b0e0fbc07c0bc98cec3567ce37de4b075f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>