Break up vl.h.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3674 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/hw/usb.c b/hw/usb.c
index 75e5a80..be4d66d 100644
--- a/hw/usb.c
+++ b/hw/usb.c
@@ -21,7 +21,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-#include "vl.h"
+#include "qemu-common.h"
+#include "usb.h"
 
 void usb_attach(USBPort *port, USBDevice *dev)
 {