Add hostapd_test_utils helper methods for the am: 3454ce17 am: b3a1c626 am: 1539083a

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



Change-Id: I19e2c08a465b37c464e19b79a1424222096b81e7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>