net: stmmac: sti: Switch from CONFIG_PM_SLEEP guards to pm_sleep_ptr()

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less error prone than the
use of #ifdef based kernel configuration guards.

Signed-off-by: Raphael Gallais-Pou <rgallaispou@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Link: https://patch.msgid.link/20250109155842.60798-1-rgallaispou@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c

@@ -313,7 +313,6 @@ static void sti_dwmac_remove(struct platform_device *pdev)
 	clk_disable_unprepare(dwmac->clk);
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int sti_dwmac_suspend(struct device *dev)
 {
 	struct sti_dwmac *dwmac = get_stmmac_bsp_priv(dev);
@@ -333,10 +332,9 @@ static int sti_dwmac_resume(struct device *dev)
 
 	return stmmac_resume(dev);
 }
-#endif /* CONFIG_PM_SLEEP */
 
-static SIMPLE_DEV_PM_OPS(sti_dwmac_pm_ops, sti_dwmac_suspend,
-					   sti_dwmac_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(sti_dwmac_pm_ops, sti_dwmac_suspend,
+						  sti_dwmac_resume);
 
 static const struct sti_dwmac_of_data stih4xx_dwmac_data = {
 	.fix_retime_src = stih4xx_fix_retime_src,
@@ -353,7 +351,7 @@ static struct platform_driver sti_dwmac_driver = {
 	.remove = sti_dwmac_remove,
 	.driver = {
 		.name           = "sti-dwmac",
-		.pm		= &sti_dwmac_pm_ops,
+		.pm		= pm_sleep_ptr(&sti_dwmac_pm_ops),
 		.of_match_table = sti_dwmac_match,
 	},
 };