mmc: mediatek: mark PM functions as __maybe_unused

The #ifdef check for the suspend/resume functions is wrong:

drivers/mmc/host/mtk-sd.c:2765:12: error: unused function 'msdc_suspend' [-Werror,-Wunused-function]
static int msdc_suspend(struct device *dev)
drivers/mmc/host/mtk-sd.c:2779:12: error: unused function 'msdc_resume' [-Werror,-Wunused-function]
static int msdc_resume(struct device *dev)

Remove the #ifdef and mark all four as __maybe_unused to aovid the
problem.

Fixes: c0a2074 ("mmc: mediatek: Fix system suspend/resume support for CQHCI")
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20201203222922.1067522-1-arnd@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: arndb

drivers/mmc/host/mtk-sd.c

@@ -2604,7 +2604,6 @@ static int msdc_drv_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
 static void msdc_save_reg(struct msdc_host *host)
 {
 	u32 tune_reg = host->dev_comp->pad_tune_reg;
@@ -2663,7 +2662,7 @@ static void msdc_restore_reg(struct msdc_host *host)
 		__msdc_enable_sdio_irq(host, 1);
 }
 
-static int msdc_runtime_suspend(struct device *dev)
+static int __maybe_unused msdc_runtime_suspend(struct device *dev)
 {
 	struct mmc_host *mmc = dev_get_drvdata(dev);
 	struct msdc_host *host = mmc_priv(mmc);
@@ -2673,7 +2672,7 @@ static int msdc_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int msdc_runtime_resume(struct device *dev)
+static int __maybe_unused msdc_runtime_resume(struct device *dev)
 {
 	struct mmc_host *mmc = dev_get_drvdata(dev);
 	struct msdc_host *host = mmc_priv(mmc);
@@ -2683,7 +2682,7 @@ static int msdc_runtime_resume(struct device *dev)
 	return 0;
 }
 
-static int msdc_suspend(struct device *dev)
+static int __maybe_unused msdc_suspend(struct device *dev)
 {
 	struct mmc_host *mmc = dev_get_drvdata(dev);
 	int ret;
@@ -2697,11 +2696,10 @@ static int msdc_suspend(struct device *dev)
 	return pm_runtime_force_suspend(dev);
 }
 
-static int msdc_resume(struct device *dev)
+static int __maybe_unused msdc_resume(struct device *dev)
 {
 	return pm_runtime_force_resume(dev);
 }
-#endif
 
 static const struct dev_pm_ops msdc_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(msdc_suspend, msdc_resume)