Add FLAG_RECEIVER_FOREGROUND to CatService broadcast intents.

Remove dependency of BOOT_COMPLETE intent from stk app ready.
Stk app can receive broadcast intents from CatService before
BOOT_COMPLETE, when Intent flag FLAG_RECEIVER_FOREGROUND is added
to the intents. Without this flag, broadcast intents sent before
BOOT_COMPLETE are queued up by android framework.

Change-Id: I92d1ecb19fdaf1e9ed9b881c1cc15bb01b591093
CRs-Fixed: 620457