pcie: Convert PCIExpressHost to use the QOM.

Let's use PCIExpressHost with QOM.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NJason Baron <jbaron@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/pcie_host.c

@@ -145,3 +145,17 @@ void pcie_host_mmcfg_update(PCIExpressHost *e,
         pcie_host_mmcfg_map(e, addr, size);
     }
 }
+
+static const TypeInfo pcie_host_type_info = {
+    .name = TYPE_PCIE_HOST_BRIDGE,
+    .parent = TYPE_PCI_HOST_BRIDGE,
+    .abstract = true,
+    .instance_size = sizeof(PCIExpressHost),
+};
+
+static void pcie_host_register_types(void)
+{
+    type_register_static(&pcie_host_type_info);
+}
+
+type_init(pcie_host_register_types)

hw/pcie_host.h

@@ -24,6 +24,10 @@
 #include "pci_host.h"
 #include "memory.h"
 
+#define TYPE_PCIE_HOST_BRIDGE "pcie-host-bridge"
+#define PCIE_HOST_BRIDGE(obj) \
+    OBJECT_CHECK(PCIExpressHost, (obj), TYPE_PCIE_HOST_BRIDGE)
+
 struct PCIExpressHost {
     PCIHostState pci;