Add the unit of slot duration to its name. am: 9bf67194db

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/21161338

Change-Id: I288a772416f9283896fdf981096cd8cf01621049
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>