Add carrier config support to operator name in statusbar

Move configuration of showing operator name from resource to
carrier config. By moving this to carrier config, this will also
support Dual SIM scenario.

Bug: 116847905
Test: Add item for carrier in vendor.xml and swap sim cards
between ones that have the item enabled and disabled. We have
also tested to swap data sim cards on dual sim device.

Change-Id: If3b7bbe165c8f0d0305b8ae4f77c91a41a98ca14