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. 918fd0839eeafc83bd4984364321a947d29041fe for arm.

Signed-off-by: Andreas Färber <[email protected]>
diff --git a/target-openrisc/cpu.c b/target-openrisc/cpu.c
index adc03ef..54876d9 100644
--- a/target-openrisc/cpu.c
+++ b/target-openrisc/cpu.c
@@ -151,7 +151,7 @@
         .class_size = sizeof(OpenRISCCPUClass),
     };
 
-    type_register_static(&type_info);
+    type_register(&type_info);
 }
 
 static const TypeInfo openrisc_cpu_type_info = {