PM / s2idle: Rename PM_SUSPEND_FREEZE to PM_SUSPEND_TO_IDLE

To make it clear that the symbol in question refers to
suspend-to-idle, rename it from PM_SUSPEND_FREEZE to
PM_SUSPEND_TO_IDLE.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index b363283..a0a6fd1 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -719,7 +719,7 @@ static int lps0_device_attach(struct acpi_device *adev,
 			 * suspend mode was not set from the command line.
 			 */
 			if (mem_sleep_default > PM_SUSPEND_MEM)
-				mem_sleep_current = PM_SUSPEND_FREEZE;
+				mem_sleep_current = PM_SUSPEND_TO_IDLE;
 		}
 
 		acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",