Use onUnlinked in health HAL am: 1e1627a5da am: b48ba49001 am: 2d035d5408 am: 82d085a8e2

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/27145126

Change-Id: I61f45164dc3f40619bcd2ec1c7631a009995ed98
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>