spi: axi-spi-engine: use devm_spi_register_controller()

This replaces spi_register_controller() with
devm_spi_register_controller() in the AXI SPI Engine driver. This
saves us from having to call spi_unregister_controller() in the
remove function.

The remove function is also removed since it is no longer needed.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20231117-axi-spi-engine-series-1-v1-7-cc59db999b87@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-axi-spi-engine.c

@@ -532,7 +532,7 @@ static int spi_engine_probe(struct platform_device *pdev)
 	host->transfer_one_message = spi_engine_transfer_one_message;
 	host->num_chipselect = 8;
 
-	ret = spi_register_controller(host);
+	ret = devm_spi_register_controller(&pdev->dev, host);
 	if (ret)
 		return ret;
 
@@ -541,13 +541,6 @@ static int spi_engine_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static void spi_engine_remove(struct platform_device *pdev)
-{
-	struct spi_controller *host = platform_get_drvdata(pdev);
-
-	spi_unregister_controller(host);
-}
-
 static const struct of_device_id spi_engine_match_table[] = {
 	{ .compatible = "adi,axi-spi-engine-1.00.a" },
 	{ },
@@ -556,7 +549,6 @@ MODULE_DEVICE_TABLE(of, spi_engine_match_table);
 
 static struct platform_driver spi_engine_driver = {
 	.probe = spi_engine_probe,
-	.remove_new = spi_engine_remove,
 	.driver = {
 		.name = "spi-engine",
 		.of_match_table = spi_engine_match_table,