Revert "Fix the PCI header type of APB"

This reverts commit e8d2a88755b849bdadaf80d19e342eade3c017bc.

hw/apb_pci.c

diff --git a/hw/apb_pci.c b/hw/apb_pci.c
index 5f411aa..9f2a44d 100644
--- a/hw/apb_pci.c
+++ b/hw/apb_pci.c
@@ -263,7 +263,7 @@
     d->config[0x09] = 0x00; // programming i/f
     pci_config_set_class(d->config, PCI_CLASS_BRIDGE_HOST);
     d->config[0x0D] = 0x10; // latency_timer
-    d->config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_BRIDGE; // header_type
+    d->config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; // header_type
 
     /* APB secondary busses */
     *bus2 = pci_bridge_init(s->bus, 8, PCI_VENDOR_ID_SUN,