Merge "Expose SignalThresholdInfo as public class" am: a40d0d19f1 am: 239b7f35c0

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1543601

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6bee4d479269f96baaa495d6b195f05e6f8636ec