platform/mulle: Use id from MCU for address generation.

Uses the SIM UID registers to generate an address.
cpu/arm/k60: Disable LLWU debug prints.
platform/mulle: Added prefix from commandline for rpl startup script.
platform/mulle: Removed sleep from main.

Seems to be problems with it.
platform/mulle: Added router advertisment ifndef.
platform/mulle: Added interrupt attribute to radio ISR.
platform/mulle: Radio fix.
platform/mulle: Removed race on rf230_last_rssi.
Merge branch 'ltu-mulle-platform' into mulle-2-7