Add the unit of slot duration to its name. am: 9bf67194 am: 420ae531 am: 51291f24

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



Change-Id: If1f4274b47f1d9c0f382ed5999b7adb94017a6d0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>