Merge "Expose NR State string method for use in RadioInfo" into rvc-d1-dev am: 6162707258 am: 232b8dc6d2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12124535

Change-Id: Iad877802b8e0b717fbcc3fcf2b8a0a1dc23c6dce