target: Unify QOM style

Enforce the style described by commit 067109a11c ("docs/devel:
mention the spacing requirement for QOM"):

  The first declaration of a storage or class structure should
  always be the parent and leave a visual space between that
  declaration and the new code. It is also useful to separate
  backing for properties (options driven by the user) and internal
  state to make navigation easier.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-Id: <20231013140116.255-2-philmd@linaro.org>

target/arm/cpu-qom.h

@@ -46,9 +46,7 @@ void aarch64_cpu_register(const ARMCPUInfo *info);
  * An ARM CPU model.
  */
 struct ARMCPUClass {
-    /*< private >*/
     CPUClass parent_class;
-    /*< public >*/
 
     const ARMCPUInfo *info;
     DeviceRealize parent_realize;
@@ -62,9 +60,7 @@ DECLARE_CLASS_CHECKERS(AArch64CPUClass, AARCH64_CPU,
                        TYPE_AARCH64_CPU)
 
 struct AArch64CPUClass {
-    /*< private >*/
     ARMCPUClass parent_class;
-    /*< public >*/
 };
 
 void register_cp_regs_for_features(ARMCPU *cpu);

target/arm/cpu.h

@@ -852,9 +852,7 @@ typedef struct {
  * An ARM CPU core.
  */
 struct ArchCPU {
-    /*< private >*/
     CPUState parent_obj;
-    /*< public >*/
 
     CPUARMState env;