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Add pdc_cpu_rendezvous_lock() and pdc_cpu_rendezvous_unlock() to lock PDC while CPU is transitioning into rendezvous state. This is needed, because the transition phase may take up to 8 seconds. Add pdc_pat_get_PDC_entrypoint() to get PDC entry point for current CPU. Signed-off-by: Helge Deller <deller@gmx.de>