dmaengine: cppi41: mark PM functions as __maybe_unused

When CONFIG_PM_SLEEP is disabled, we get a build error in
the cppi41 dmaengine driver, since the runtime-pm functions
are hidden within the wrong #ifdef:

drivers/dma/cppi41.c:1158:21: error: 'cppi41_runtime_suspend' undeclared here (not in a function)

This removes the #ifdef and instead uses __maybe_unused
annotations that cannot have this problem.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: fdea2d09 ("dmaengine: cppi41: Add basic PM runtime support")
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/cppi41.c

@@ -1090,8 +1090,7 @@ static int cppi41_dma_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int cppi41_suspend(struct device *dev)
+static int __maybe_unused cppi41_suspend(struct device *dev)
 {
 	struct cppi41_dd *cdd = dev_get_drvdata(dev);
 
@@ -1102,7 +1101,7 @@ static int cppi41_suspend(struct device *dev)
 	return 0;
 }
 
-static int cppi41_resume(struct device *dev)
+static int __maybe_unused cppi41_resume(struct device *dev)
 {
 	struct cppi41_dd *cdd = dev_get_drvdata(dev);
 	struct cppi41_channel *c;
@@ -1127,7 +1126,7 @@ static int cppi41_resume(struct device *dev)
 	return 0;
 }
 
-static int cppi41_runtime_suspend(struct device *dev)
+static int __maybe_unused cppi41_runtime_suspend(struct device *dev)
 {
 	struct cppi41_dd *cdd = dev_get_drvdata(dev);
 
@@ -1136,7 +1135,7 @@ static int cppi41_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int cppi41_runtime_resume(struct device *dev)
+static int __maybe_unused cppi41_runtime_resume(struct device *dev)
 {
 	struct cppi41_dd *cdd = dev_get_drvdata(dev);
 	struct cppi41_channel *c, *_c;
@@ -1151,7 +1150,6 @@ static int cppi41_runtime_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static const struct dev_pm_ops cppi41_pm_ops = {
 	SET_LATE_SYSTEM_SLEEP_PM_OPS(cppi41_suspend, cppi41_resume)