bta::dm::disc Remove already included function declarations am: ff734e75

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2853223



Change-Id: I281b83824da7e2c327bfa1e241c285a67b655bc3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>