target/arm: Remove size and alignment for cpu subclasses

Inherit the size and alignment from TYPE_ARM_CPU.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/arm/cpu.c

@@ -2423,10 +2423,7 @@ void arm_cpu_register(const ARMCPUInfo *info)
 {
     TypeInfo type_info = {
         .parent = TYPE_ARM_CPU,
-        .instance_size = sizeof(ARMCPU),
-        .instance_align = __alignof__(ARMCPU),
         .instance_init = arm_cpu_instance_init,
-        .class_size = sizeof(ARMCPUClass),
         .class_init = info->class_init ?: cpu_register_class_init,
         .class_data = (void *)info,
     };