Merge "Preparation to expose SignalThresholdInfo as public class" am: e630298ff1 am: 0d70182b0b

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1532541

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I28f1eefa79c4b767aab44bb12c2a2602084d95ce