Add Active Display to AOKP [2/2]

* Amazing work by 0xD34D
* Since he encouraged cherry-picking this, and I was very interested in
     porting this from Moto X, thus I am introducing it here

Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>
Change-Id: I134aee969659e62051e12561fa09759385b9654f
Active display: allow hiding low priority notifications. [2/2]

Change-Id: Id1d23f7c35e50b1b53a8c656ed7497478afff3bc