Input: pwm-beeper: add CONFIG_PM_SLEEP to suspend/resume

Add CONFIG_PM_SLEEP to suspend/resume functions to fix the build warnings 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.

drivers/input/misc/pwm-beeper.c:147:12: warning: 'pwm_beeper_suspend' defined but not used [-Wunused-function] drivers/input/misc/pwm-beeper.c:157:12: warning: 'pwm_beeper_resume' defined but not used [-Wunused-function]

---
 drivers/input/misc/pwm-beeper.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index a37f0c9..2ff4d1c 100644
@@ -143,7 +143,7 @@ static int pwm_beeper_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int pwm_beeper_suspend(struct device *dev)
 {
 	struct pwm_beeper *beeper = dev_get_drvdata(dev);

1.7.10.4