target-openrisc: Use type_register() instead of type_register_static()

According to its documentation, type_register_static()'s TypeInfo
argument should exist for the life type of the type.
Therefore use type_register() when registering the list of CPU subtypes.

No functional change with the current implementation.

Cf. 918fd083 for arm.
Signed-off-by: NAndreas Färber <afaerber@suse.de>

target-openrisc/cpu.c

@@ -151,7 +151,7 @@ static void cpu_register(const OpenRISCCPUInfo *info)
         .class_size = sizeof(OpenRISCCPUClass),
     };
 
-    type_register_static(&type_info);
+    type_register(&type_info);
 }
 
 static const TypeInfo openrisc_cpu_type_info = {