pinctrl: plgpio: 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/pinctrl/spear/pinctrl-plgpio.c:645:12: warning: 'plgpio_suspend' defined but not used [-Wunused-function]
drivers/pinctrl/spear/pinctrl-plgpio.c:684:12: warning: 'plgpio_resume' defined but not used [-Wunused-function]

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/spear/pinctrl-plgpio.c

@@ -75,7 +75,7 @@ struct plgpio {
 	int			(*o2p)(int offset);	/* offset_to_pin */
 	u32			p2o_regs;
 	struct plgpio_regs	regs;
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 	struct plgpio_regs	*csave_regs;
 #endif
 };
@@ -554,7 +554,7 @@ static int plgpio_probe(struct platform_device *pdev)
 	if (IS_ERR(plgpio->clk))
 		dev_warn(&pdev->dev, "clk_get() failed, work without it\n");
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 	plgpio->csave_regs = devm_kzalloc(&pdev->dev,
 			sizeof(*plgpio->csave_regs) *
 			DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG),
@@ -641,7 +641,7 @@ unprepare_clk:
 	return ret;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int plgpio_suspend(struct device *dev)
 {
 	struct plgpio *plgpio = dev_get_drvdata(dev);