Remove unused main::shim::link_policy code am: 729a6afb am: 7483a6ff

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2129637



Change-Id: I1c7e0436d71897e77f3e591e2a19f4c7c038767b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>