feat: Actually start core1 payload

Signed-off-by: Rahix <rahix@rahix.de>

epicardium/main.c

+#include <stdio.h>
 #include "card10.h"
 
 int main(void)
 {
 	card10_init();
 	card10_diag();
+
+	printf("Staring core1 payload ...\n");
+	core1_start();
 }