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 9bbafce2
(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>

arch/sh/kernel/process_64.c

@@ -28,6 +28,7 @@
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
+#include <asm/fpu.h>
 
 struct task_struct *last_task_used_math = NULL;
 

arch/sh/kernel/ptrace_64.c

@@ -33,6 +33,7 @@
 #include <asm/system.h>
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
+#include <asm/fpu.h>
 
 /* This mask defines the bits of the SR which the user is not allowed to
    change, which are everything except S, Q, M, PR, SZ, FR. */

arch/sh/kernel/signal_64.c

@@ -26,6 +26,7 @@
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/cacheflush.h>
+#include <asm/fpu.h>
 
 #define REG_RET 9
 #define REG_ARG1 2

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