PM: Add missing "freeze" state

Fix descriptions of /sys/power/state in the documentation and in
a code comment.
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Documentation/ABI/testing/sysfs-power

@@ -12,8 +12,9 @@ Contact:	Rafael J. Wysocki <rjw@rjwysocki.net>
 Description:
 		The /sys/power/state file controls the system power state.
 		Reading from this file returns what states are supported,
-		which is hard-coded to 'standby' (Power-On Suspend), 'mem'
-		(Suspend-to-RAM), and 'disk' (Suspend-to-Disk).
+		which is hard-coded to 'freeze' (Low-Power Idle), 'standby'
+		(Power-On Suspend), 'mem' (Suspend-to-RAM), and 'disk'
+		(Suspend-to-Disk).
 
 		Writing to this file one of these strings causes the system to
 		transition into that state. Please see the file

kernel/power/main.c

@@ -282,8 +282,8 @@ struct kobject *power_kobj;
  *	state - control system power state.
  *
  *	show() returns what states are supported, which is hard-coded to
- *	'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
- *	'disk' (Suspend-to-Disk).
+ *	'freeze' (Low-Power Idle), 'standby' (Power-On Suspend),
+ *	'mem' (Suspend-to-RAM), and 'disk' (Suspend-to-Disk).
  *
  *	store() accepts one of those strings, translates it into the
  *	proper enumerated value, and initiates a suspend transition.