i2c: puv3: add CONFIG_PM_SLEEP to suspend function

Add CONFIG_PM_SLEEP to suspend function to fix the following build warning when CONFIG_PM_SLEEP is not selected. This is because sleep PM callbacks defined by SIMPLE_DEV_PM_OPS are only used when the CONFIG_PM_SLEEP is enabled.

drivers/i2c/busses/i2c-puv3.c:249:12: warning: 'puv3_i2c_suspend' defined but not used [-Wunused-function]

---
 drivers/i2c/busses/i2c-puv3.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 37a84c8..ac80199 100644
@@ -245,7 +245,7 @@ static int puv3_i2c_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int puv3_i2c_suspend(struct device *dev)
 {
 	int poll_count;

1.7.10.4