Merge "Move BitUtils, RingBuffer test to coretests" am: 35362a9dc1 am: e12829fdea am: 89c3a316fc am: fe8331a6b1

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1754896

Change-Id: I864a389788fd20fb1d66b73b7b3ac2a4caa80da1