Disintegrate asm/system.h for S390

Disintegrate asm/system.h for S390.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-s390@vger.kernel.org
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h
index 797f787..c77c6de 100644
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -9,7 +9,7 @@
 
 #ifdef CONFIG_SMP
 
-#include <asm/system.h>
+#include <asm/lowcore.h>
 
 #define raw_smp_processor_id()	(S390_lowcore.cpu_nr)