Add the unit of slot duration to its name. am: 5363e6a547 am: a78939e711

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

Change-Id: Ib1907fa63bd24f5492754bc63a78399e5f9b7d64
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>