Merge "Expose SignalThresholdInfo as public class" am: a40d0d19f1

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1d87cb3565a42b9dd2f533d27b55f2ec49545b3b