Merge "libutils: remove obsolete README." am: c85c9ee4e6 am: 542b434331 am: 47f22f9ba7

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1703649

Change-Id: I1c3156ddd57102f5ba29c34b2b3b8474ca1aff7f