OutgoingCallBroadcaster: add subscription id to NEW_OUTGOING_CALL

This extra is sent on the stock ROM of many multi-SIM implementation
according to the author of the app "Operadora DDD". This allows
applications intercepting outgoing calls to know which SIM the
call is being made with.

http://forum.xda-developers.com/showpost.php?p=52940171&postcount=1876

Change-Id: I5bb379ea924209edb3dd01482f8dd5454a064de1