buildroot

m68k: fix open issues with qemu coldfire

Enable kernel drivers for networking and add a simple
busybox config with basic network tools.

Add kernel patch from Linux git to fix hush segfaults while
using signal handler.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>