sh64: add missing #include <asm/fpu.h>'s

This patch fixes some compile errors due to missing save_fpu()
prototypes on sh64 caused by
commit 9bbafce2eec190ef7e44b0eb1095ba17ce6ad3af
(sh: Fix occasional FPU register corruption under preempt).

Signed-off-by: Adrian Bunk <adrian.bunk@movial.fi>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/traps_64.c b/arch/sh/kernel/traps_64.c
index 1b58a74..a85831c 100644
--- a/arch/sh/kernel/traps_64.c
+++ b/arch/sh/kernel/traps_64.c
@@ -30,6 +30,7 @@
 #include <asm/atomic.h>
 #include <asm/processor.h>
 #include <asm/pgtable.h>
+#include <asm/fpu.h>
 
 #undef DEBUG_EXCEPTION
 #ifdef DEBUG_EXCEPTION