PM: Fix build issue in main.c for CONFIG_PM_SLEEP unset

Suspend statistics should depend on CONFIG_PM_SLEEP, so make that
happen.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 2757acb..a52e884 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -133,8 +133,6 @@
 power_attr(pm_test);
 #endif /* CONFIG_PM_DEBUG */
 
-#endif /* CONFIG_PM_SLEEP */
-
 #ifdef CONFIG_DEBUG_FS
 static char *suspend_step_name(enum suspend_stat_step step)
 {
@@ -230,6 +228,8 @@
 late_initcall(pm_debugfs_init);
 #endif /* CONFIG_DEBUG_FS */
 
+#endif /* CONFIG_PM_SLEEP */
+
 struct kobject *power_kobj;
 
 /**