drivers: i3c: cdns: add api call for default handler

add api calls for the default handlers for i2c and i3c rtio

Signed-off-by: Ryan McClelland <[email protected]>

drivers/i3c/i3c_cdns.c

@@ -3284,6 +3284,9 @@ static int cdns_i3c_bus_init(const struct device *dev)
 static struct i3c_driver_api api = {
 	.i2c_api.configure = cdns_i3c_i2c_api_configure,
 	.i2c_api.transfer = cdns_i3c_i2c_api_transfer,
+#ifdef CONFIG_I2C_RTIO
+	.i2c_api.iodev_submit = i2c_iodev_submit_fallback,
+#endif
 
 	.configure = cdns_i3c_configure,
 	.config_get = cdns_i3c_config_get,
@@ -3310,6 +3313,10 @@ static struct i3c_driver_api api = {
 	.ibi_disable = cdns_i3c_controller_ibi_disable,
 	.ibi_raise = cdns_i3c_target_ibi_raise,
 #endif
+
+#ifdef CONFIG_I3C_RTIO
+	.iodev_submit = i3c_iodev_submit_fallback,
+#endif
 };
 
 #define CADENCE_I3C_INSTANTIATE(n)                                                                 \