crypto: picoxcell - add connection ID to the clock name

For using the device tree probing we use a connection ID for the
clk_get() operation.

Cc: Herbert Xu <[e-mail]>
Signed-off-by: Jamie Iles <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/picoxcell_crypto.c

···
 
 	spin_lock_init(&engine->hw_lock);
 
-	engine->clk = clk_get(&pdev->dev, NULL);
+	engine->clk = clk_get(&pdev->dev, "ref");
 	if (IS_ERR(engine->clk)) {
 		dev_info(&pdev->dev, "clk unavailable\n");
 		device_remove_file(&pdev->dev, &dev_attr_stat_irq_thresh);