Merge "Specify is_fixed_read_only: true for mainline trunk stable flag" into main am: 470658a590 am: 569313ff70

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3227506

Change-Id: I778d94d258013716485560193139b18341d9da30
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>