Merge "Docs: return EARLY_BOOT_ENDED instead of INVALID_KEY_BLOB." am: 6796c8b5aa

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2160639

Change-Id: I038bf7c4590425e88e4611dd36f4f6f3a0e35c4f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>