A recent set of changes changed the kernel name from bzImage to vmlinux,
this test needs to change also.
(From OE-Core rev: f11f03b27bd0bf41bcb45d0589d9982d006474d2)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>