powerpc: Fix some #ifndef __KERNEL__ that should be #ifdef

Grrr....
Signed-off-by: Paul Mackerras <paulus@samba.org>

include/asm-powerpc/heathrow.h

 #ifndef _ASM_POWERPC_HEATHROW_H
 #define _ASM_POWERPC_HEATHROW_H
-#ifndef __KERNEL__
+#ifdef __KERNEL__
 /*
  * heathrow.h: definitions for using the "Heathrow" I/O controller chip.
  *

include/asm-powerpc/ohare.h

 #ifndef _ASM_POWERPC_OHARE_H
 #define _ASM_POWERPC_OHARE_H
-#ifndef __KERNEL__
+#ifdef __KERNEL__
 /*
  * ohare.h: definitions for using the "O'Hare" I/O controller chip.
  *

include/asm-powerpc/seccomp.h

 #ifndef _ASM_POWERPC_SECCOMP_H
 #define _ASM_POWERPC_SECCOMP_H
 
-#ifndef __KERNEL__
+#ifdef __KERNEL__
 #include <linux/thread_info.h>
 #endif