fixed printf specifiers

boards/avsextrem/drivers/avsextrem-cc1100.c

boards/msba2-common/tools/src/download.c

boards/msba2/msba2-cc110x.c

cpu/arm_common/arm_cpu.c

cpu/arm_common/syscalls.c

cpu/lpc1768/syscalls.c

sys/net/network_layer/sixlowpan/icmp.c

sys/ps/ps.c

sys/shell/commands/sc_id.c

sys/shell/commands/sc_rpl.c

tests/test_posix_sleep/main.c

tests/test_queue_fairness/main.c