IA2: Use btm_interface for bta::dm::discovery am: 9aff5801

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2666380



Change-Id: I2196e312db81009566050b3f266c2f8f36d319f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>