As Martin and Ross suggested.
(From OE-Core rev: 33fb5629c8a306b00d84f564df2faa81501deadd)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>