Decouple btm_offload feature from MBO feature am: 84bb3e1228 am: 9908660b69

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/wpa_supplicant_8/+/14937871

Change-Id: I1cc99406641311a87eb153a41b6536b08bce61a9