Merge "Expose NR State string method for use in RadioInfo" into rvc-d1-dev am: 6162707258 am: 0d1ad1b52e am: db58964211

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

Change-Id: I6c110f8ea4ab88a50b3f79329dfc0c2a98c0e9de