PM / sleep: Simplify sleep states sysfs interface code

Simplify the sleep states sysfs interface /sys/power/state code by
redefining pm_states[] as an array of pointers to constant strings
such that only the entries corresponding to valid states are set.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/kernel/power/power.h b/kernel/power/power.h
index c60f13b..5d49dca 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -178,13 +178,8 @@
 				unsigned int, char *);
 
 #ifdef CONFIG_SUSPEND
-struct pm_sleep_state {
-	const char *label;
-	suspend_state_t state;
-};
-
 /* kernel/power/suspend.c */
-extern struct pm_sleep_state pm_states[];
+extern const char *pm_states[];
 
 extern int suspend_devices_and_enter(suspend_state_t state);
 #else /* !CONFIG_SUSPEND */