Merge "Le Scan: Add ambient discovery mode (2/2)" am: 6a86b6d738 am: 67635a1e13 am: 6bd6affdfb

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Bluetooth/+/1629493

Change-Id: I48ff78ae3317f71dd468cfb3958b5c1fcd78fefb