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
SettingsProvider: fix load protected sms setting logic

The method assumed a string resource, but we are working with
string-arrays.

Change-Id: I7d03821c5f5ac5d24445e5c03f7911c3a81c16dd
Signed-off-by: Roman Birg <roman@cyngn.com>