spi: rspi: Remove useless .set_config_register() check

Not implementing spi_ops.set_config_register() is a driver bug that
would prevent the driver from working at all.
Hence remove the run-time check.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200819125904.20938-2-geert+renesas@glider.beSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-rspi.c

@@ -1261,13 +1261,6 @@ static int rspi_probe(struct platform_device *pdev)
 			ctlr->num_chipselect = 2; /* default */
 	}
 
-	/* ops parameter check */
-	if (!ops->set_config_register) {
-		dev_err(&pdev->dev, "there is no set_config_register\n");
-		ret = -ENODEV;
-		goto error1;
-	}
-
 	rspi = spi_controller_get_devdata(ctlr);
 	platform_set_drvdata(pdev, rspi);
 	rspi->ops = ops;