Merge "KeyMint HALs: clarifications" am: 46f99f4e9a am: ee63e2489a am: 5ad931e0a6

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1846278

Change-Id: I114795b1426f5d55b3f370615c43292669062379
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>