Remove utilite patches directory
Add support for building RIoTboard images.

This is a script to build images for the RIoTboard, which is a single core i.MX6 device from Embest/element14.

There won't be official images released, but the script is here for people who want to try it out.  At the moment we build off a github kernel, but 3.16 should have support for the RIoTboard in mainline.
Fix serial console for rpi, trimslice, and utilite
Add raspberrypi kernel config
Update rpi to use our kernel config