mmc: sdhci-esdhc-imx: fix defined but not used warnings

Fix warnings when CONFIG_PM=y and CONFIG_PM_SLEEP is not set by
surrounding the 2 functions with #ifdef CONFIG_PM_SLEEP.

drivers/mmc/host/sdhci-esdhc-imx.c:1659:13: warning: 'sdhc_esdhc_tuning_restore' defined but not used [-Wunused-function]
 1659 | static void sdhc_esdhc_tuning_restore(struct sdhci_host *host)
drivers/mmc/host/sdhci-esdhc-imx.c:1637:13: warning: 'sdhc_esdhc_tuning_save' defined but not used [-Wunused-function]
 1637 | static void sdhc_esdhc_tuning_save(struct sdhci_host *host)

Fixes: 3d1eea493894 ("mmc: sdhci-esdhc-imx: Save tuning value when card stays powered in suspend")
Signed-off-by: Randy Dunlap <[email protected]>
Reviewed-by: Haibo Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: rddunlap

drivers/mmc/host/sdhci-esdhc-imx.c

@@ -1634,6 +1634,7 @@ static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
 	}
 }
 
+#ifdef CONFIG_PM_SLEEP
 static void sdhc_esdhc_tuning_save(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -1688,6 +1689,7 @@ static void sdhc_esdhc_tuning_restore(struct sdhci_host *host)
 		       host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
 	}
 }
+#endif
 
 static void esdhc_cqe_enable(struct mmc_host *mmc)
 {