i2c: xgene: Fix missing code of DTB support

In DTB case, i2c-core doesn't create slave device which is installed
on i2c-xgene bus because of missing code in this driver.
This patch fixes this issue.
Signed-off-by: NTin Huynh <tnhuynh@apm.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-xgene-slimpro.c

@@ -415,6 +415,7 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
 	adapter->algo = &xgene_slimpro_i2c_algorithm;
 	adapter->class = I2C_CLASS_HWMON;
 	adapter->dev.parent = &pdev->dev;
+	adapter->dev.of_node = pdev->dev.of_node;
 	i2c_set_adapdata(adapter, ctx);
 	rc = i2c_add_adapter(adapter);
 	if (rc) {