Escape newlines in `-v printable`. am: 522baf2487 am: c044ddf0fc

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

Change-Id: I9dac7ee45221a216766e71f30d22835b35c7897c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>