ACPI: PM: Drop unused function and function header

Remove a leftover function header and a static inline stub with no
users from the ACPI header file.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

include/linux/acpi.h

@@ -913,7 +913,6 @@ static inline int acpi_dev_pm_attach(struct device *dev, bool power_on)
 #endif
 
 #if defined(CONFIG_ACPI) && defined(CONFIG_PM_SLEEP)
-int acpi_dev_suspend_late(struct device *dev);
 int acpi_subsys_prepare(struct device *dev);
 void acpi_subsys_complete(struct device *dev);
 int acpi_subsys_suspend_late(struct device *dev);
@@ -922,7 +921,6 @@ int acpi_subsys_suspend(struct device *dev);
 int acpi_subsys_freeze(struct device *dev);
 int acpi_subsys_poweroff(struct device *dev);
 #else
-static inline int acpi_dev_resume_early(struct device *dev) { return 0; }
 static inline int acpi_subsys_prepare(struct device *dev) { return 0; }
 static inline void acpi_subsys_complete(struct device *dev) {}
 static inline int acpi_subsys_suspend_late(struct device *dev) { return 0; }