hmp: hmp.h: include qdict.h

hmp.h is relying on qdict.h being provided by qapi-types.h. Fix this,
as a future commit will change qapi-types.h not to provide qdict.h.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>

hmp.h

@@ -16,6 +16,7 @@
 
 #include "qemu-common.h"
 #include "qapi-types.h"
+#include "qdict.h"
 
 void hmp_info_name(Monitor *mon);
 void hmp_info_version(Monitor *mon);