sim: Use correct unit for abort message
sim: Use correct unit for abort message

This patch fixes the unit in the abort printout.
(transplanted from 0d8e24faf1f857cdf49f91e5521c4addca48e749)

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin