Adding support AGM1264k-FL monochrome display

This display contains two ks0108 compatable controllers with own CS pins.
I have used Image Dithering algorytm (“Floyd-Steinberg”) to translate RGB565 color to bitmap. All calculations uses les than 10% of cpu on my Beaglebone Black at 20FPS.
![img_20141119_160348](https://cloud.githubusercontent.com/assets/2912756/5106120/d4f415d4-7005-11e4-8f48-8ca154f52dd5.jpg)