Stopped using GPT partition table in mkefidisk.wks as it's not
supported by all reference hardware.
(From OE-Core rev: 07bb11b097a67ff89ae633fa1992db5494d75c0c)
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>