Disintegrate asm/system.h for Sparc

Disintegrate asm/system.h for Sparc.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: sparclinux@vger.kernel.org
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 8e16a4a..28559ce 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -25,6 +25,8 @@
 #include <linux/atomic.h>
 #include <asm/nmi.h>
 #include <asm/pcr.h>
+#include <asm/perfctr.h>
+#include <asm/cacheflush.h>
 
 #include "kernel.h"
 #include "kstack.h"