Add API for protected SMS receive broadcasts.

  - Allows an application to receive an sms (usually for auth
  or registration) from whitelisted addresses, without broadcasting
  to any other listeners.

  - Allows an application to modify the whitelisted addresses within
  System.Secure settings.

Change-Id: I5dfeb94832eefac9607070e9fb29db589bac7a57

Conflicts:
	packages/SettingsProvider/res/values/defaults.xml
	packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java