[AArch64] Scale the absolute frequency to the monitoring interval #42

Job	Run time
Build on debian-testing amd64	1m 41s
Build on debian-10-buster amd64	51s
Build on ubuntu-rolling amd64	54s
Build on ubuntu-16.04-xenial amd64	47s
Build on ubuntu-14.04-lucid amd64	49s
Build on alpine-latest amd64	43s
Build on debian-testing aarch64	13m 11s
Build on debian-10-buster aarch64	2m 15s
Build on ubuntu-rolling aarch64	3m 28s
Build on ubuntu-16.04-xenial aarch64	2m 13s
Build on ubuntu-14.04-trusty aarch64	2m 2s
Build on alpine-latest aarch64	1m 44s
	30m 38s

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