Telephony: Add RECEIVER_FOREGROUND flag for idle screen broadcast intent.

Normal priority broadcast intents get queued up in application broadcast
queue, if BOOT_COMPLETE is not yet received by the application.
Adding FLAG_RECEIVER_FOREGROUND to the intent allows it to be delivered
to the application without waiting for BOOT_COMPLETE.
This is necessary to prevent some GCF tests from timing out due to
delayed delivery of CAT_IDLE_SCREEN_ACTION to Stk application.

Change-Id: I9776000243944c4ca77aac277f6697495136f8cf
CRs-Fixed: 635236