Move LPCOpen drivers to a different repo

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.

The issue names the LPCOpen drivers but no files or tests. Start by locating those drivers and checking the repository's license and build configuration; done means the drivers live in a separate repository, are included here as a submodule, and their incompatible license is no longer bundled with this code.

Written by the indexing model from the issue text.