spi: rpc-if: Remove CONFIG_PM_SLEEP ifdefery

Use __maybe_unused for the suspend()/resume() hooks and get rid of
the CONFIG_PM_SLEEP ifdefery to improve the code.
Suggested-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Pavel Machek <pavel@denx.de>
Link: https://lore.kernel.org/r/20201230145708.28544-3-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-rpc-if.c

@@ -176,15 +176,14 @@ static int rpcif_spi_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int rpcif_spi_suspend(struct device *dev)
+static int __maybe_unused rpcif_spi_suspend(struct device *dev)
 {
 	struct spi_controller *ctlr = dev_get_drvdata(dev);
 
 	return spi_controller_suspend(ctlr);
 }
 
-static int rpcif_spi_resume(struct device *dev)
+static int __maybe_unused rpcif_spi_resume(struct device *dev)
 {
 	struct spi_controller *ctlr = dev_get_drvdata(dev);
 
@@ -192,17 +191,13 @@ static int rpcif_spi_resume(struct device *dev)
 }
 
 static SIMPLE_DEV_PM_OPS(rpcif_spi_pm_ops, rpcif_spi_suspend, rpcif_spi_resume);
-#define DEV_PM_OPS	(&rpcif_spi_pm_ops)
-#else
-#define DEV_PM_OPS	NULL
-#endif
 
 static struct platform_driver rpcif_spi_driver = {
 	.probe	= rpcif_spi_probe,
 	.remove	= rpcif_spi_remove,
 	.driver = {
 		.name	= "rpc-if-spi",
-		.pm	= DEV_PM_OPS,
+		.pm	= &rpcif_spi_pm_ops,
 	},
 };
 module_platform_driver(rpcif_spi_driver);