i2c: pnx: 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 SIMPLE_DEV_PM_OPS are only used when the CONFIG_PM_SLEEP is enabled.

drivers/i2c/busses/i2c-pnx.c:599:12: warning: 'i2c_pnx_controller_suspend' defined but not used [-Wunused-function] drivers/i2c/busses/i2c-pnx.c:608:12: warning: 'i2c_pnx_controller_resume' defined but not used [-Wunused-function]

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

index 5f39c6d..1713b3e 100644
@@ -595,7 +595,7 @@ static struct i2c_algorithm pnx_algorithm = {
 	.functionality = i2c_pnx_func,
 };
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int i2c_pnx_controller_suspend(struct device *dev)
 {
 	struct i2c_pnx_algo_data *alg_data = dev_get_drvdata(dev);

1.7.10.4