Move LPCOpen drivers to a different repo

[henrique-silva]

LPCOpen license:

Permission to use, copy, modify, and distribute this software and its documentation is hereby granted, under NXP Semiconductors' and its licensor's relevant copyrights in the software, without fee, provided that it is used in conjunction with NXP Semiconductors microcontrollers. This copyright, permission, and disclaimer notice must appear in all copies of this code.

This section in bold makes the license incompatible with GPLv3, so we cannot have it together with our code in this repo. The solution is to upload the drivers to a different repo and instantiate it as a submodule here.

[henrique-silva]

http://programmers.stackexchange.com/questions/240633/is-licensing-an-issue-for-git-submodules
Interesting discussion comparing the submodules with the debian packages.