Use get_btm_client_interface for security calls am: b914dd51 am: 17cb9d4c am: 4d887049

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2786422



Change-Id: I757ccb937b4c546733447e4489ce191cc42b88b1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>