Add the unit of slot duration to its name. am: 5363e6a547

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2443724

Change-Id: Idbb46f28bf8f87d77f95c0d5162590785ecb6ce4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>