tests/gnrc_ipv6_nib_6ln: add msb-430* to BOARD_INSUFFICIENT_MEMORY
tests/gnrc_ipv6_nib_6ln: add msb-430* to BOARD_INSUFFICIENT_MEMORY

The new fixed code paths with the 6LN/6Lo distinction make this
application too big for the given boards

RIOT-OS/RIOT,kaspar030/RIOT,smlng/RIOT,x3ro/RIOT,toonst/RIOT,OTAkeys/RIOT,kaspar030/RIOT,miri64/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,aeneby/RIOT,ant9000/RIOT,OlegHahm/RIOT,kaspar030/RIOT,basilfx/RIOT,toonst/RIOT,kYc0o/RIOT,aeneby/RIOT,OlegHahm/RIOT,smlng/RIOT,authmillenon/RIOT,kaspar030/RIOT,basilfx/RIOT,basilfx/RIOT,OTAkeys/RIOT,kYc0o/RIOT,aeneby/RIOT,OlegHahm/RIOT,authmillenon/RIOT,jasonatran/RIOT,smlng/RIOT,miri64/RIOT,aeneby/RIOT,kaspar030/RIOT,kYc0o/RIOT,mtausig/RIOT,x3ro/RIOT,jasonatran/RIOT,basilfx/RIOT,mtausig/RIOT,x3ro/RIOT,yogo1212/RIOT,OTAkeys/RIOT,aeneby/RIOT,miri64/RIOT,authmillenon/RIOT,yogo1212/RIOT,authmillenon/RIOT,jasonatran/RIOT,miri64/RIOT,ant9000/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,miri64/RIOT,mtausig/RIOT,yogo1212/RIOT,x3ro/RIOT,OTAkeys/RIOT,yogo1212/RIOT,jasonatran/RIOT,authmillenon/RIOT,smlng/RIOT,ant9000/RIOT,ant9000/RIOT,RIOT-OS/RIOT,toonst/RIOT,OlegHahm/RIOT,mtausig/RIOT,authmillenon/RIOT,kYc0o/RIOT,mtausig/RIOT,yogo1212/RIOT,OTAkeys/RIOT,josephnoir/RIOT,josephnoir/RIOT,toonst/RIOT,kYc0o/RIOT,yogo1212/RIOT,x3ro/RIOT,jasonatran/RIOT,ant9000/RIOT,basilfx/RIOT,OlegHahm/RIOT,josephnoir/RIOT,smlng/RIOT,toonst/RIOT