target-*: Clean up cpu.h header guards

Most of them use guard symbols like CPU_$target_H, but we also have
__MIPS_CPU_H__ and __TRICORE_CPU_H__. They all upset
scripts/clean-header-guards.pl.

The script dislikes CPU_$target_H because they don't match their file
name (they should, to make guard collisions less likely). The others
are reserved identifiers.

Clean them all up: use guard symbol $target_CPU_H for
target-$target/cpu.h.

Backports commit 07f5a258750b3b9a6e10fd5ec3e29c9a943b650e from qemu

qemu/target-arm/cpu.h

@@ -16,8 +16,9 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef CPU_ARM_H
-#define CPU_ARM_H
+
+#ifndef ARM_CPU_H
+#define ARM_CPU_H
 
 #include "config.h"
 

qemu/target-i386/cpu.h

@@ -16,8 +16,9 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef CPU_I386_H
-#define CPU_I386_H
+
+#ifndef I386_CPU_H
+#define I386_CPU_H
 
 #include "config.h"
 #include "qemu-common.h"

qemu/target-m68k/cpu.h

@@ -17,8 +17,9 @@
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef CPU_M68K_H
-#define CPU_M68K_H
+
+#ifndef M68K_CPU_H
+#define M68K_CPU_H
 
 #define TARGET_LONG_BITS 32
 

qemu/target-mips/cpu.h

@@ -1,5 +1,5 @@
-#if !defined (__MIPS_CPU_H__)
-#define __MIPS_CPU_H__
+#ifndef MIPS_CPU_H
+#define MIPS_CPU_H
 
 //#define DEBUG_OP
 
@@ -1064,4 +1064,4 @@ static inline void QEMU_NORETURN do_raise_exception(CPUMIPSState *env,
     do_raise_exception_err(env, exception, 0, pc);
 }
 
-#endif /* !defined (__MIPS_CPU_H__) */
+#endif /* MIPS_CPU_H */

qemu/target-sparc/cpu.h

@@ -1,5 +1,5 @@
-#ifndef CPU_SPARC_H
-#define CPU_SPARC_H
+#ifndef SPARC_CPU_H
+#define SPARC_CPU_H
 
 #include "config.h"
 #include "qemu-common.h"