change i.mx6 platform data

[gymnae]

I noticed that the driver wouldn't compile anymore since armbian upgrade to 4.9.x as stable. The makefile didn't pick up the architecture properly. There was also a kinda lost mx61 platform definition seemingly prepared for local usage of one dev - i modified to work universally and make the driver compile on my cubox-i again.

This enables universal compiling on freescale i-mx6 machines like cubox-i with new kernel versions (testet 4.9.12)

[diederikdehaas]

Looks good. I try to test/verify it soon, but I expect to merge it 👍