The list in the IMAGE_TYPES variable description has been
updated to add and remove several image types.
(From yocto-docs rev: b598590074d41b0eedc8466b325632caeed52e3b)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>