Merge "IServiceManager: add registerForNotifications." am: e9692d4243 am: c7855d9256 am: 86f10de161

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1967236

Change-Id: Ia2bf2e4208d615fe10ecb031633e9f2a1bdd5d0e