gd: Fix compilation issues caused by init flags

- Remove use of init flags in logging outside android / floss
  build environment
- Add missing library dependency libbt_shim_ffi to
  net_test_btif_hf_client_service

Bug: 305066880
Test: m com.android.btservices
Change-Id: Ib5ae419193bff22aa27b5ec5e89a167b6e668569