arch/arm64: provide boot_cpu()

Change-Id: I708041133dfafdc97e052952ad9d8f2e4164209c
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10105
Tested-by: build bot (Jenkins)

src/arch/arm64/cpu.c

@@ -22,6 +22,7 @@
 #include <arch/lib_helpers.h>
 #include <cpu/cpu.h>
 #include <console/console.h>
+#include <smp/node.h>
 #include "cpu-internal.h"
 
 struct cpu_info cpu_infos[CONFIG_MAX_CPUS];
@@ -218,3 +219,8 @@ void arch_cpu_wait_for_action(void)
 		action_queue_complete(q, orig);
 	}
 }
+
+int boot_cpu(void)
+{
+	return cpu_is_bsp();
+}