Merge "Move wifi related hidden API flag file entries to packages/modules/Wifi" into sc-dev am: e39e5258 am: 24e1c7cc am: 60bbda6c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15132973

Change-Id: Ieef3acda1aaf3b37597aa3074f1f01ca0c83215a