x86/fpu: Move the xstate copying functions into fpu/internal.h

All the other register<-> memory copying functions are defined
in fpu/internal.h, so move the xstate variants there too.

Beyond being more consistent, this also allows FPU debugging
checks to be added to them. (Because they can now use the
macros defined in fpu/internal.h.)

Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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