stack::rnr Introduce btm_stack_rnr_test am: 2098b15e

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3151048



Change-Id: I370d49b1cd68681e377e6d6d2bb16f0f44146bce
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>