Related to #104
Add a LICENSE file listing all licenses used by recipes in the meta-freescale-distro layer.
* Create a new `LICENSE` file in the root directory.
* List all the licenses used by the recipes in this layer, including MIT, LGPL-2.0-only, LGPL-2.1-only, BSD-3-Clause, and GPL-3.0-only.
* Include the license names and the corresponding recipes that use them.
