The binutils-cross-x86_64 is not avaliable for non x86-64 machines.
(From OE-Core rev: 02385b180bc4a1af7120e85a9998566bfcb85977)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>