monitor: move include files to include/monitor/

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/vl.c b/vl.c
index 015f0a4..9adaf28 100644
--- a/vl.c
+++ b/vl.c
@@ -129,7 +129,7 @@
 #include "bt-host.h"
 #include "net/net.h"
 #include "net/slirp.h"
-#include "monitor.h"
+#include "monitor/monitor.h"
 #include "ui/console.h"
 #include "sysemu.h"
 #include "exec/gdbstub.h"