net: stmmac: platform: fix build warning when with !CONFIG_PM_SLEEP

Use __maybe_unused for noirq_suspend()/noirq_resume() hooks to avoid
build warning with !CONFIG_PM_SLEEP:

>> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:796:12: error: 'stmmac_pltfr_noirq_resume' defined but not used [-Werror=unused-function]
     796 | static int stmmac_pltfr_noirq_resume(struct device *dev)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:775:12: error: 'stmmac_pltfr_noirq_suspend' defined but not used [-Werror=unused-function]
     775 | static int stmmac_pltfr_noirq_suspend(struct device *dev)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

Fixes: 276aae37 ("net: stmmac: fix system hang caused by eee_ctrl_timer during suspend/resume")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

@@ -772,7 +772,7 @@ static int __maybe_unused stmmac_runtime_resume(struct device *dev)
 	return stmmac_bus_clks_config(priv, true);
 }
 
-static int stmmac_pltfr_noirq_suspend(struct device *dev)
+static int __maybe_unused stmmac_pltfr_noirq_suspend(struct device *dev)
 {
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct stmmac_priv *priv = netdev_priv(ndev);
@@ -793,7 +793,7 @@ static int stmmac_pltfr_noirq_suspend(struct device *dev)
 	return 0;
 }
 
-static int stmmac_pltfr_noirq_resume(struct device *dev)
+static int __maybe_unused stmmac_pltfr_noirq_resume(struct device *dev)
 {
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct stmmac_priv *priv = netdev_priv(ndev);