Add a copy of the GPL in the flashrom repository as it's an independent
project (being packaged by distros, among other things).

Corresponding to flashrom svn r134 and coreboot v2 svn r2764.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>