This patch makes sure that the resulting cfg takes into consideration
the kernel image type for the specific machine. This change makes now
the recipe/package machine specific so we drop allarch and set
PACKAGE_ARCH accordingly.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>
Signed-off-by: Luca Seritan <luca.seritan@huawei.com>