Add hostapd_test_utils helper methods for the am: 3454ce17 am: b3a1c626

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24589589



Change-Id: Ie55f46e50cffadc806e83428e665035d37f647a0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>