exec: move include files to include/exec/

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index dd1a650..97d3a93 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -21,7 +21,7 @@
 #include "balloon.h"
 #include "virtio-balloon.h"
 #include "kvm.h"
-#include "exec-memory.h"
+#include "exec/address-spaces.h"
 
 #if defined(__linux__)
 #include <sys/mman.h>