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To support platforms which are based on multi-threaded CPUs, override
the weak implementation of plat_arm_get_cpu_pe_count function to return
the number of threads supported by the CPU used in the platform.

Change-Id: Ia680773f1277b17e2d3d2414d87943dcece33e89
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>