Changed code region to any

Original discussion [Here](http://sourceforge.net/p/contiki/mailman/message/32628670/)

Tested with json-ws test application at examples/ipv6/json-ws.

Original:
> websense-z1.z1 section `.far.text' will not fit in region `far_rom'
> region `far_rom' overflowed by 376 bytes

Amended:
msp430-size websense-z1.z1 
>   text    data	    bss	    dec	    hex	filename
>  48260	    594	   5936	  54790	   d606	websense-z1.z1