sh: fix up fallout from system.h disintegration.

Quite a bit of fallout all over the place, nothing terribly exciting.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/flush-sh4.c b/arch/sh/mm/flush-sh4.c
index 75a17f5..0b85dd9 100644
--- a/arch/sh/mm/flush-sh4.c
+++ b/arch/sh/mm/flush-sh4.c
@@ -1,5 +1,6 @@
 #include <linux/mm.h>
 #include <asm/mmu_context.h>
+#include <asm/cache_insns.h>
 #include <asm/cacheflush.h>
 #include <asm/traps.h>