[automerger skipped] Expose SignalStrength copy constructor am: 34cb6f99e7 am: b0ed9bd725 am: 80fbbe764a am: b3fd799eb0 -s ours

am skip reason: Change-Id I863f46dde78cf5e7ed9ed2f6bea149ab20daadbd with SHA-1 b321b8fefe is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1480896

Change-Id: Ia52bb75dfcb820b7e62f2f41b97d840c4837a13c