ACPI: PM: Set .detach in acpi_general_pm_domain definition

Instead of setting the .detach callback pointer for acpi_general_pm_domain
every time it is attached to a device, which is confusing, set it once
in the definition of acpi_general_pm_domain.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://patch.msgid.link/4665476.LvFx2qVVIh@rjwysocki.net
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: rafaeljw

drivers/acpi/device_pm.c

@@ -1362,6 +1362,8 @@ static int acpi_subsys_poweroff_noirq(struct device *dev)
 }
 #endif /* CONFIG_PM_SLEEP */
 
+static void acpi_dev_pm_detach(struct device *dev, bool power_off);
+
 static struct dev_pm_domain acpi_general_pm_domain = {
 	.ops = {
 		.runtime_suspend = acpi_subsys_runtime_suspend,
@@ -1382,6 +1384,7 @@ static struct dev_pm_domain acpi_general_pm_domain = {
 		.restore_early = acpi_subsys_restore_early,
 #endif
 	},
+	.detach = acpi_dev_pm_detach,
 };
 
 /**
@@ -1465,7 +1468,6 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on)
 		acpi_device_wakeup_disable(adev);
 	}
 
-	dev->pm_domain->detach = acpi_dev_pm_detach;
 	return 1;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);