x86/fpu: Rename fpu-internal.h to fpu/internal.h

This unifies all the FPU related header files under a unified, hiearchical
naming scheme:

 - asm/fpu/types.h:      FPU related data types, needed for 'struct task_struct',
                         widely included in almost all kernel code, and hence kept
                         as small as possible.

 - asm/fpu/api.h:        FPU related 'public' methods exported to other subsystems.

 - asm/fpu/internal.h:   FPU subsystem internal methods

 - asm/fpu/xsave.h:      XSAVE support internal methods

(Also standardize the header guard in asm/fpu/internal.h.)

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/fpu/core.c

@@ -5,7 +5,7 @@
  *  General FPU state handling cleanups
  *	Gareth Hughes <gareth@valinux.com>, May 2000
  */
-#include <asm/fpu-internal.h>
+#include <asm/fpu/internal.h>
 
 /*
  * Track whether the kernel is using the FPU state

arch/x86/kernel/fpu/init.c

@@ -1,7 +1,7 @@
 /*
  * x86 FPU boot time init code
  */
-#include <asm/fpu-internal.h>
+#include <asm/fpu/internal.h>
 #include <asm/tlbflush.h>
 
 /*

arch/x86/kernel/fpu/xsave.c

@@ -10,7 +10,7 @@
 #include <linux/compat.h>
 #include <linux/cpu.h>
 #include <asm/fpu/api.h>
-#include <asm/fpu-internal.h>
+#include <asm/fpu/internal.h>
 #include <asm/sigframe.h>
 #include <asm/tlbflush.h>
 #include <asm/xcr.h>