cpu/atmega_common/periph_timer: fix spurious IRQs [backport 2022.10] #18981
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Backport of #18978
Contribution description
As the tile says
Testing procedure
tests/periph_timer
from #18963 andtests/periph_timer_periodic
should pass. (They do on thearduino-mega2560
.)Issues/PRs references
#18976