Adding the ability for carrier app to override SPN and carrier name.

The change allows system apps (holding MODIFY_PHONE_STATE permission) or
carrier apps to override the "carrier branding" on a per ICCID basis. The
override affects the service provider name as well as the network operator
name. The override is also saved as a SharedPreference and will persist for
the iccId across reboots.

Change-Id: I985ba247e10e2501e3d0d21567ccadc46f365879
15 files changed
tree: 0fff478ca89adee6570a5a6b0ebbe796af53a3ab
  3. README.txt
  4. src/
  5. tests/
  6. tools/