Merge "Floss: Add GATT client command for registering notification" am: f35269ad

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2455509



Change-Id: I3e8e5a7e0cf8297639b10f7df6d42662155145e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>