Add test service for HIDL active services callback. am: 4d375a10b9 am: 6aa22e2055 am: 08dc6d4f3e

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/15363836

Change-Id: I4fc86da6da418ae89bb7b78be4a5c80703b81e13