Merge "Expose NR State string method for use in RadioInfo" into rvc-d1-dev am: 6162707258 am: 0d1ad1b52e

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

Change-Id: I285db86dad3167e76dbf41cc1eaca681c8b55d80