[coreboot] licensing text

[mrnuke]

On Wednesday, February 12, 2014 03:16:43 PM ron minnich wrote:
> let's do it this way. Why doesn't one of you just propose the wording.
> 
Let's try this again:

 * LICENSE_TAG: GPLv2+ (See README in top-level directory for explanation)
 * LICENSE_TAG: GPLv2 (See README in top-level directory for explanation)
 * LICENSE_TAG: BSD3c (See README in top-level directory for explanation)
 * LICENSE_TAG: BSD2c (See README in top-level directory for explanation)
 * Public domain (See README in top-level directory for explanation)

Alex