Added test cases to build qemux86_directdisk, mkgummidisk and
mkefdisk images.
(From OE-Core rev: f2d75d76d1af9e4852637f60eac8dfc967431acb)
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>