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]

Signed-off-by: Jingoo Han <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/misc/pwm-beeper.c

···
 	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);