make mapRetrieveWO take exclusive lock am: 7eb7d67279

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3134022

Change-Id: Id6d2e5f4d159cae27aa62b12ccc2a1c70771907e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>