AudioService: Remove STREAM_NOTIFICATION from ringer mode streams

Change-Id: Ie8d25743b27839fa2bd4e9ae5d3d0a49410ac5b4
JIRA: CYAN-344
Issue: https://jira.cyanogenmod.org/browse/CYAN-344
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Reduce observers in SystemUI: StatusBarIconView

Currently, for each status bar icon view there is a observer that
listens for changes of STATUS_BAR_NOTIF_COUNT. With one
notification usually having one or more status bar icons
you may end up easily with 10+ more observers for ~5 notifications.

With this commit the internal observer class becomes a singleton.
This means there is now only one observer for all status bar icons
and additional binder calls on new notification are avoided.

See "dumpsys content"

Change-Id: I8c11b165b34b87e7363a8e96524ea70fe6b28342
SystemUI: Update brightness dialog, on updateResources()

The small dialog also deserves the chance to get updated
resources.

Thank you Jiangyi, for finding that one.

Patch Set 2: Unbreak things

Change-Id: I6e9de7c35abff52c2fcc2952771bb42b406496ed
Pie: let Chevron adapt itself from pie's angle.
>
> This make Chevron able to recreate the battery bar when the angle changes.
Pie: set angle default to 12° (1/2)