operator-overlay: Move config to display operator name to CarrierConfig

This is now moved to CarrierConfig as per the following two commits:
* platform/frameworks/base@f3dfaa3590e7
* platform/packages/apps/Settings@87e2471ab6

Issue: FP3-A13#48
Change-Id: I4d4473588a40cc1feaf9edd45049cef431a23f4e
Depends-On: Idf7c94a5a3e9e5ad637bef3d3031fa4ae65af710
3 files changed