Triggering notifications when dual CDMA SIM combinations are detected

In Settings, catch the intent from Telephony about SIM combination
warning and show a notification about it.

Bug: 132631355
Test: manual - have two cdma capable subscriptions active, make sure
the notification is sent, and tapping on it leads to the helper page.

Change-Id: Ifd0e13781e4afc3bfd82415b3e51fd10176d9f9d