Add Timeout numeric parameter

Following the examples of the others, adding Timeout as an allowed
numeric parameter, for use by ExternalSensor in dbus-sensors,
although other users are certainly welcome to use it as well.

Signed-off-by: Josh Lehan <krellan@google.com>
Change-Id: Ibac74a3ed30ebf970358b3193eb5b39f11f75215
diff --git a/schemas/legacy.json b/schemas/legacy.json
index 73d513c..df605ed 100644
--- a/schemas/legacy.json
+++ b/schemas/legacy.json
@@ -186,6 +186,9 @@
                 "Thresholds": {
                     "$ref": "#/definitions/Types/Thresholds"
                 },
+                "Timeout": {
+                    "$ref": "#/definitions/Types/Timeout"
+                },
                 "HostSMbusIndex": {
                     "$ref": "#/definitions/Types/HostSMbusIndex"
                 },
@@ -558,6 +561,9 @@
                 },
                 "type": "array"
             },
+            "Timeout": {
+                "type": "number"
+            },
             "HostSMbusIndex": {
                 "type": "number"
             },