Cat: Add support for Activate cmd and HCI connectivity event

Add FLAG_RECEIVER_FOREGROUND to CatService broadcast intents

Stk app is unable to receive broadcasts from CatService until
BOOT_COMPLETED intent is received from framework.

FLAG_RECEIVER_FOREGROUND flag is added to the intents sent
by CatService so that Stk app can receive these broadcasts
before BOOT_COMPLETED is received.

Change-Id: Ica8e72e354891438dcd6b7e899a2ba78d980d396

Cat: Add support for Activate cmd and HCI connectivity event

Add support for Activate proactive command defined in ETSI TS
102 223 [6.4.40] and HCI connectivity event defined in ETSI TS
102 223 [7.5.18].

CRs-Fixed: 618962

Change-Id: I3755cb275a09a346d7b0b799242c818d969f8dff