Use qemu-common.h or qemu-timer.h in place of sysemu.h

In some cases qemu-common.h or qemu-timer.h can be used in place
of sysemu.h.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/net/dump.c b/net/dump.c
index 83eda0f..0d0cbb2 100644
--- a/net/dump.c
+++ b/net/dump.c
@@ -24,9 +24,9 @@
 
 #include "dump.h"
 #include "qemu-common.h"
-#include "sysemu.h"
 #include "qemu-error.h"
 #include "qemu-log.h"
+#include "qemu-timer.h"
 
 typedef struct DumpState {
     VLANClientState nc;