Loongarch: remove arch_*register_cpu() exports

arch_register_cpu() and arch_unregister_cpu() are not used by anything
that can be a module - they are used by drivers/base/cpu.c and
drivers/acpi/acpi_processor.c, neither of which can be a module.

Remove the exports.
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/E1r5R2w-00Csyn-E2@rmk-PC.armlinux.org.ukSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/loongarch/kernel/topology.c

@@ -25,7 +25,6 @@ int arch_register_cpu(int cpu)
 
 	return ret;
 }
-EXPORT_SYMBOL(arch_register_cpu);
 
 void arch_unregister_cpu(int cpu)
 {
@@ -34,7 +33,6 @@ void arch_unregister_cpu(int cpu)
 	c->hotpluggable = 0;
 	unregister_cpu(c);
 }
-EXPORT_SYMBOL(arch_unregister_cpu);
 #endif
 
 static int __init topology_init(void)