[TelephonyMainline] @hide @SystemApi and revisit them in S. - CarrierColumns

Test: manual
Bug: 144455212
Change-Id: I719ee0a4d23dcb7786954fe2741f3830d3d3a5bc
Merged-In: I719ee0a4d23dcb7786954fe2741f3830d3d3a5bc
2 files changed