blockdev: Collect block device code in new blockdev.c

Anything that moves hundreds of lines out of vl.c can't be all bad.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/hw/apb_pci.c b/hw/apb_pci.c
index b53e3c3..31c8d70 100644
--- a/hw/apb_pci.c
+++ b/hw/apb_pci.c
@@ -31,6 +31,7 @@
 #include "pci_host.h"
 #include "rwhandler.h"
 #include "apb_pci.h"
+#include "sysemu.h"
 
 /* debug APB */
 //#define DEBUG_APB