Clean up IPCLIENT_GARP_NA_ROAMING experiment am: 3d7d38b9d7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/3525610

Change-Id: I43a8ed976c59b4baa0a67cee10b58e3b53c59d37
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>