[Buildroot] Atmel 9260 EABI build

[Norman Cheung]

I am having similar issues:
- OABI works but not EABI(kernel works but not root fs),
- fails at init/login respawning
- Also EABI kernel can mount an NFS root(glibc not build by buildroot)
The behavior looked similar to this post (June 2007) 
http://www.busybox.net/lists/buildroot/2007-June/003206.html

I also noticed that the sub-arch is not set.  I wonder what is the 
correct setting for an EABI build? with or without 926t?

Thanks,
Norman