Decouple btm_offload feature from MBO feature am: 84bb3e1228 am: ca66b5af1d

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

Change-Id: Icf1d9811d539c83f9e4bbc580e036dcdea51ae0b