sh64: Fixup the nommu build.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/cache-sh5.c b/arch/sh/mm/cache-sh5.c
index 3877321..9e277ec 100644
--- a/arch/sh/mm/cache-sh5.c
+++ b/arch/sh/mm/cache-sh5.c
@@ -714,6 +714,7 @@
 	sh64_icache_inv_current_user_range(vaddr, end);
 }
 
+#ifdef CONFIG_MMU
 /*
  * These *MUST* lie in an area of virtual address space that's otherwise
  * unused.
@@ -830,3 +831,4 @@
 	else
 		sh64_clear_user_page_coloured(to, address);
 }
+#endif