Some mega boards enabling global irq at board_init. This moves that responsability to cpu/avr8_common to create a common point to all variants. Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
Refactor atmega_ prefix to avr8_ prefix and update copyrights. Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>