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AMU counters are used for monitoring the CPU performance. RD-V1-MC
platform has architected AMU available for each core. Enable the use of
AMU by non-secure OS for supporting the use of counters for processor
performance control (ACPI CPPC).

Change-Id: I33be594cee669e7f4031e5e5a371eec7c7451030
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>