mfd: sec-core: sec_pmic_{suspend,resume}() should depend on CONFIG_PM_SLEEP

If CONFIG_PM_SLEEP=n:

drivers/mfd/sec-core.c:349: warning: ‘sec_pmic_suspend’ defined but not used
drivers/mfd/sec-core.c:371: warning: ‘sec_pmic_resume’ defined but not used

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
index a139798..714e213 100644
--- a/drivers/mfd/sec-core.c
+++ b/drivers/mfd/sec-core.c
@@ -315,6 +315,7 @@
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
 static int sec_pmic_suspend(struct device *dev)
 {
 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
@@ -349,6 +350,7 @@
 
 	return 0;
 }
+#endif /* CONFIG_PM_SLEEP */
 
 static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);