usb: dwc3: add CONFIG_PM_SLEEP to suspend/resume functions

Add CONFIG_PM_SLEEP to suspend/resume functions to fix the following
build warning when CONFIG_PM_SLEEP is not selected. This is because
sleep PM callbacks defined by SET_SYSTEM_SLEEP_PM_OPS are only used
when the CONFIG_PM_SLEEP is enabled. Unnecessary CONFIG_PM ifdefs
are removed.

drivers/usb/dwc3/core.c:682:12: warning: 'dwc3_suspend' defined but not used [-Wunused-function]
drivers/usb/dwc3/core.c:709:12: warning: 'dwc3_resume' defined but not used [-Wunused-function]
drivers/usb/dwc3/dwc3-omap.c:430:12: warning: 'dwc3_omap_suspend' defined but not used [-Wunused-function]
drivers/usb/dwc3/dwc3-omap.c:440:12: warning: 'dwc3_omap_resume' defined but not used [-Wunused-function]
drivers/usb/dwc3/dwc3-exynos.c:185:12: warning: 'dwc3_exynos_suspend' defined but not used [-Wunused-function]
drivers/usb/dwc3/dwc3-exynos.c:194:12: warning: 'dwc3_exynos_resume' defined but not used [-Wunused-function]

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.c

@@ -634,7 +634,7 @@ static int dwc3_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int dwc3_prepare(struct device *dev)
 {
 	struct dwc3	*dwc = dev_get_drvdata(dev);

drivers/usb/dwc3/dwc3-exynos.c

@@ -181,7 +181,7 @@ static const struct of_device_id exynos_dwc3_match[] = {
 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
 #endif
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int dwc3_exynos_suspend(struct device *dev)
 {
 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
@@ -212,7 +212,7 @@ static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 #define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
 #else
 #define DEV_PM_OPS	NULL
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
 
 static struct platform_driver dwc3_exynos_driver = {
 	.probe		= dwc3_exynos_probe,

drivers/usb/dwc3/dwc3-omap.c

@@ -410,7 +410,7 @@ static const struct of_device_id of_dwc3_match[] = {
 };
 MODULE_DEVICE_TABLE(of, of_dwc3_match);
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int dwc3_omap_prepare(struct device *dev)
 {
 	struct dwc3_omap	*omap = dev_get_drvdata(dev);
@@ -461,7 +461,7 @@ static const struct dev_pm_ops dwc3_omap_dev_pm_ops = {
 #define DEV_PM_OPS	(&dwc3_omap_dev_pm_ops)
 #else
 #define DEV_PM_OPS	NULL
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
 
 static struct platform_driver dwc3_omap_driver = {
 	.probe		= dwc3_omap_probe,