[automerger skipped] test: Add mock function map to target net_test_stack_btm...

[automerger skipped] test: Add mock function map to target net_test_stack_btm am: a8db30d7 -s ours am: bf6a848b -s ours

am skip reason: Merged-In Idfd4e501e453864798f9bb1b00f35dd4fdef6db0 with SHA-1 05e76850 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/21737805



Change-Id: Id540d36da4313551874705c6f7e6809d6606a68f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>