target-openrisc: Fix typename in openrisc_cpu_class_by_name()

Commit 478032a9 (target-openrisc:
Rename CPU subtypes) suffixed CPU sub-types with "-or32-cpu" but forgot
to update openrisc_cpu_class_by_name(), so that it was still looking for
the types without suffix.

Make target-openrisc running OK by adding the suffix to the model name.

This means it is no longer possible to use -cpu or1200-or32-cpu or
-cpu any-or32-cpu though.

Cc: qemu-stable@nongnu.org
Signed-off-by: NDongxue Zhang <elta.era@gmail.com>
Tested-by: NJia Liu <proljc@gmail.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

target-openrisc/cpu.c

@@ -96,12 +96,14 @@ static void openrisc_cpu_initfn(Object *obj)
 static ObjectClass *openrisc_cpu_class_by_name(const char *cpu_model)
 {
     ObjectClass *oc;
+    char *typename;
 
     if (cpu_model == NULL) {
         return NULL;
     }
 
-    oc = object_class_by_name(cpu_model);
+    typename = g_strdup_printf("%s-" TYPE_OPENRISC_CPU, cpu_model);
+    oc = object_class_by_name(typename);
     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_OPENRISC_CPU) ||
                        object_class_is_abstract(oc))) {
         return NULL;