KERNEL_CONFIG_COMMAND will be expanded by bitbake, so can be
used directly in kernel_do_configure()
(From OE-Core rev: f8a35d8e312df908c73724465035921856d30781)
Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>