Fix code format for core

Signed-off-by Zhong Hongbo <bocui107@gmai.com>
Fix code format for cpu/avr
Fix the code format for avr-ravenusb

Signed-off-by Zhong Hongbo <bocui107@gmai.com>
raven: Fix the compile fail

Signed-off-by Zhong Hongbo <bocui107@gmail.com>