gn2bp: add newlines in genrule commands for better diffs am: 9b99a984d1

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2276593

Change-Id: Ia342325b3f9e62f774e24a7c292c653c04763040
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>