MFD / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM

After commit b2b49ccbdd (PM: Kconfig: Set PM_RUNTIME if PM_SLEEP is
selected) PM_RUNTIME is always set if PM is set, so #ifdef blocks
depending on CONFIG_PM_RUNTIME may now be changed to depend on
CONFIG_PM.

Replace CONFIG_PM_RUNTIME with CONFIG_PM everywhere under
drivers/mfd/.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/wm8994-core.c

@@ -116,7 +116,7 @@ static const char *wm8958_main_supplies[] = {
 	"SPKVDD2",
 };
 
-#ifdef CONFIG_PM_RUNTIME
+#ifdef CONFIG_PM
 static int wm8994_suspend(struct device *dev)
 {
 	struct wm8994 *wm8994 = dev_get_drvdata(dev);