Do not push carrier configs when they are not for an identified carrier am:...

Do not push carrier configs when they are not for an identified carrier am: 4a4d1ff9 am: f29fb059

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/1961641

Change-Id: I45c9e161061c24d96b784d86efff7a769baf8e72