Support to show long or short name in SystemUI.

Supports to switch show long nameor short name.
Add two configs for switching which format need show.
config_show_long_operator_name -- decide to whether show long name
under normal form.
config_show_long_operator_name_when_roaming -- decide to whether show
long name when roaming.

Change-Id: I496274a6c497bf16cea493c401b3d76c62cbcd92
CRs-fixed: 1037642
2 files changed