tc0: add support for changing the frequency of all the CPUs

Merged Darryl Green requested to merge github/fork/uarif1/tc0_secondary_cores_cpufreq into master

Created by: uarif1

This patch adds support for changing the frequency of all the cores, e.g. when the governor changes the frequency of the cluster.

Signed-off-by: Usama Arif usama.arif@arm.com Change-Id: I04668b53e472e2f3e43b177f2852052318e4e206

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