Register rtc options for -set

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/qemu-config.c b/qemu-config.c
index ca93dc7..2e396ae 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -176,6 +176,7 @@
     &qemu_drive_opts,
     &qemu_chardev_opts,
     &qemu_device_opts,
+    &qemu_rtc_opts,
     NULL,
 };