x86, bitops: Move fls64.h inside __KERNEL__

We would include <asm-generic/bitops/fls64.h> even without __KERNEL__,
but that doesn't make sense, as:

1. That file provides fls64(), but the corresponding function fls() is
not exported to user space.
2. The implementation of fls64.h uses kernel-only symbols.
3. fls64.h is not exported to user space.

This appears to have been a bug introduced in checkin:

d57594c203b1 bitops: use __fls for fls64 on 64-bit archs

Cc: Stephen Hemminger <[e-mail]>
Cc: Alexander van Heukelum <[e-mail]>
Cc: David Howells <[e-mail]>
Signed-off-by: H. Peter Anvin <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]

arch/x86/include/asm/bitops.h

···
 	return word;
 }
 
+#undef ADDR
+
 #ifdef __KERNEL__
 /**
  * ffs - find first set bit in word
···
 #endif
 	return r + 1;
 }
-#endif /* __KERNEL__ */
-
-#undef ADDR
-
-#ifdef __KERNEL__
 
 #include <asm-generic/bitops/find.h>
 
···
 
 #include <asm-generic/bitops/const_hweight.h>
 
-#endif /* __KERNEL__ */
-
 #include <asm-generic/bitops/fls64.h>
-
-#ifdef __KERNEL__
 
 #include <asm-generic/bitops/le.h>