Update the author indo and use variables for author and email to make it
easier to change in future.
(From yocto-docs rev: 4fdf2a060705fa00b11b5a9d270f4ffa506c9927)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>