Revert "gn2bp: Remove `soong_namespace`" am: 8484ec4dcd

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2505958

Change-Id: If94589a125c316679b5524240446596ff88b6328
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>