platform/mulle: Refactor set_rime_addr()

Refactored set_rime_addr() to prevent warnings about differing
signedness in the debug printfs.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
platform/mulle: Add WITH_ASCII to contiki-conf.h.

PETSCII is the character set used on Commodore platforms, and Contiki
uses this encoding by default in some situations. Every non-Commodore
platform should define WITH_ASCII.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
cpu/arm/k60: fault-handlers: fix warnings.

Cast to unsigned int when printing with %x to silence a gcc warning.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
cpu/arm/k60: Refactor C99 loop initializer.

SystemInit had an for loop defined variable only allowed in C99.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>