bta: Use proper api to reset control block bta::test::bta_disc_test am:...

bta: Use proper api to reset control block bta::test::bta_disc_test am: 834a62c3 am: ac085a18 am: 331406ce

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2825172



Change-Id: I1582c1f922fef7fd3b09654cfc7a07071876b4aa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>