There is a missing dependency (creation of "src/_generated" directory)
of some tasks. Add it to fix the parallel make issue.
[YOCTO #783]
(From OE-Core rev: 184b5c83df9ecdb1891b760155d6a9ce587531ae)
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>