avr-ravenlcd: Fix code style for ravenlcd

Signed-off-by Zhong Hongbo <bocui107@163.com>
avr-ravenlcd: Fix code style core/sys

Signed-off-by Zhong Hongbo <bocui107@163.com>
avr-ravenlcd: Fix code style for net

Signed-off-by Zhong Hongbo <bocui107@163.com>
raven: Fix code format

Signed-off-by Zhong Hongbo <bocui107@163.com>