ARC: [eznps] change busybox defconfig

This one includes telnetd/ftpd

Signed-off-by: Noam Camus <noamc@ezchip.com>
ARC: [eznps] add BR2 defconfig

This is minimal configuration for EZdk

Signed-off-by: Noam Camus <noamc@ezchip.com>