qapi: Convert block_set_io_throttle

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/hmp.h b/hmp.h
index 621bdc2..aab0b1f 100644
--- a/hmp.h
+++ b/hmp.h
@@ -53,5 +53,6 @@
 void hmp_expire_password(Monitor *mon, const QDict *qdict);
 void hmp_eject(Monitor *mon, const QDict *qdict);
 void hmp_change(Monitor *mon, const QDict *qdict);
+void hmp_block_set_io_throttle(Monitor *mon, const QDict *qdict);
 
 #endif