enable btf for offload.o & test.o am: 07d3013b0d am: 546a507a94

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2089289

Change-Id: I4e3d6e3059c1c5f149685715f7d5686ab98af70a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>