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

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

Change-Id: I5c7745b52efd0e257da1f6420078d4b6bbad169c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>