Remove libosi from net_test_stack_btm as it's using a mock am: 38fe8978

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2704093



Change-Id: I63afe5770664c44ab0ea8098d6d4fe29a7b487f6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>