asf: use KBUILD_OUTPUT to point to build-artifacts
In poky commit
46cdaf1, the kernel build output was put into
kernel-build-artifacts, and kernel-source is kept "pristine".
KERNEL_PATH points to kernel-source, while KBUILD_OUTPUT points
to build-artifacts which can be used for external module build.
asf Makefile tries to include the .config, use KBUILD_OUTPUT to
avoid build error.
It is needed to process all the Makefile with new revision.
Signed-off-by: Ting Liu <ting.liu@freescale.com>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
