Break up vl.h.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3674 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 3c04e3a..75f412a 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -22,7 +22,10 @@
  * THE SOFTWARE.
  */
 
-#include "vl.h"
+#include "hw.h"
+#include "pc.h"
+#include "pci.h"
+
 typedef uint32_t pci_addr_t;
 #include "pci_host.h"