ACPI / PM: Remove stale function header

acpi_dev_pm_get_node() isn't used or implemented, so remove it.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/linux/acpi.h

@@ -868,17 +868,12 @@ int acpi_dev_runtime_suspend(struct device *dev);
 int acpi_dev_runtime_resume(struct device *dev);
 int acpi_subsys_runtime_suspend(struct device *dev);
 int acpi_subsys_runtime_resume(struct device *dev);
-struct acpi_device *acpi_dev_pm_get_node(struct device *dev);
 int acpi_dev_pm_attach(struct device *dev, bool power_on);
 #else
 static inline int acpi_dev_runtime_suspend(struct device *dev) { return 0; }
 static inline int acpi_dev_runtime_resume(struct device *dev) { return 0; }
 static inline int acpi_subsys_runtime_suspend(struct device *dev) { return 0; }
 static inline int acpi_subsys_runtime_resume(struct device *dev) { return 0; }
-static inline struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
-{
-	return NULL;
-}
 static inline int acpi_dev_pm_attach(struct device *dev, bool power_on)
 {
 	return -ENODEV;