Merge "[LE unicast] The isBusy state should involve the state of sub device" into tm-qpr-dev am: 6e4c896775 am: c6cc319d41

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20059745

Change-Id: Ia1de4d623521c4cded71c2cc38c148a962af3a18
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>