Fix duplicate devices when multiple mediums scanning requested am: b8b53f3b...

Fix duplicate devices when multiple mediums scanning requested am: b8b53f3b am: 57a46768 am: c88bc262

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12295535

Change-Id: Id1d5cd6752e321d4836adc5819b2ba31b8ab6e1a