Use the hostapd_test_utils helper methods in am: c6cacf61 am: b2d1a3b4 am: 9af8f6c1

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24589850



Change-Id: Ibced01c90f8eedd1e8e0f4eb980334140b3513bf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>