MediaFocusControl: Do not grant audio focus if notification stream is 0

Previously audio focus would be granted regardless of notification volume, meaning
that if notifications are muted the media stream would still be dimished for focus.
By checking if STREAM_NOTIFICATION is 0 and if a notification stream is
requesting focus, this no longer an issue.

PS1: Initial implement
PS2: Better implement in MediaFocusControl
PS3: Whitespace

Change-Id: Ie10a64e58ce77174a3bbdeaa936646d40c24404f
Signed-off-by: Evan Anderson <evan1124@gmail.com>
MediaFocusControl: Fix audio focus logic

This fixes commit 007e15d5d.

Should have been checking for when the notification stream is 0, not non-zero.

Change-Id: Idde589064082875d13a342445bb2b9de6b41e872
Signed-off-by: Evan Anderson <evan1124@gmail.com>