Fix linux-menuconfig Makefile target.
Fix linux-menuconfig Makefile target.

It now uses the output-* directory corresponding to the target architecture
under out/buildroot.

Fixes: d1829f24ec6d ("small fixes")
Signed-off-by: Francis Laniel <1493dd5457177a02e7616fdf81fd4bc3e79dbd48@linux.microsoft.com>

kubernetes/minikube,kubernetes/minikube,kubernetes/minikube,kubernetes/minikube,kubernetes/minikube,kubernetes/minikube,kubernetes/minikube