[DMA Engine Framework] status report #10, #11

[Jakub Klama]

During week 10 I was on the vacation, so no work was made.
On week 11:

* Completed DMA channel allocation mechanism
* Completed _arm_memcpy bindings
* Working on documentation
* Fixed many bugs in framework

Plans for next week:

* Update wiki page
* Do some cleanups & more bugfixes
* Try to complete documentation 
* Try to complete unit tests

-- 
Jakub Klama