Add notification sounds from CyanogenMod

Change-Id: I4f1d7469c87ed8e1c262998941fa969892ab0ea9
New MDPI icons for PIE quick toggle
MDPI icon for PIE toggle is an old one.  Icon is from the HDPI set.

Change-Id: Ic7b1480e5e06efb5704c8a8fdf55f6476da45e3f