Escape newlines in `-v printable`. am: 522baf2487 am: 9d25de7017

Original change: https://android-review.googlesource.com/c/platform/system/logging/+/2860428

Change-Id: I9f0933c00a197f57bedd53bf726b89e110aa569e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>