frameworks/base: Fix delay in sending AUDIO_BECOMING_NOISY intent

AUDIO_BECOMING_NOISY intent is sent as background intent which causes
delay in receiving pause event. This delay caused audio leak. By
marking the event as FLAG_RECEIVER_FOREGROUND, this intent is
received sooner by Application.

Change-Id: Ib978cf8322dcddbc01f59824f95fa7800f9c35af
CRs-Fixed: 652549
Code cleanup.

Enforce 100 char line length, and remove checks for always-true
conditions.

Change-Id: Ie24d12919859e8269f77fabf93b3d745ece94479