Actually add /ibm,opal/fast-reboot property

[ Upstream commit aeb3669 ]

I missed a hunk when merging :(

Reported-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Fixes: 7c8e1c6
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

core/fast-reboot.c

@@ -71,6 +71,17 @@ void disable_fast_reboot(const char *reason)
 	fast_reboot_disabled = reason;
 }
 
+void add_fast_reboot_dt_entries(void)
+{
+	dt_check_del_prop(opal_node, "fast-reboot");
+
+	if (fast_reboot_disabled) {
+		dt_add_property_string(opal_node, "fast-reboot", fast_reboot_disabled);
+	} else {
+		dt_add_property_string(opal_node, "fast-reboot", "okay");
+	}
+}
+
 /*
  * This is called by the reboot CPU after all other CPUs have been
  * quiesced and stopped, to perform various sanity checks on firmware