Schema: Add attributes "PollRate" and "_Scale".

Add two objects: "PollRate" and "iout1_Scale" to schema/legacy.json.
"PollRate" has been implemented in here:
https://gerrit.openbmc-project.xyz/c/openbmc/dbus-sensors/+/38796

test:
Add these two attributes to my configuration file and file can pass to
validate-configs.py.

Signed-off-by: Scron Chang <Scron.Chang@quantatw.com>
Change-Id: Ia8c8047566b57d799af66934cca835a6b199e186
diff --git a/schemas/legacy.json b/schemas/legacy.json
index a8cc2cf..5e9fe82 100644
--- a/schemas/legacy.json
+++ b/schemas/legacy.json
@@ -267,6 +267,12 @@
                 "pout1_Offset": {
                     "$ref": "#/definitions/Types/pout1_Offset"
                 },
+                "iout1_Scale": {
+                    "$ref": "#/definitions/Types/iout1_Scale"
+                },
+                "PollRate": {
+                    "$ref": "#/definitions/Types/PollRate"
+                },
                 "Type": {
                     "$ref": "#/definitions/Types/Type"
                 }
@@ -621,9 +627,16 @@
             "pout1_Offset": {
                 "type": "number"
             },
+            "iout1_Scale": {
+                "type": "number"
+            },
+            "PollRate": {
+                "type": "number"
+            },
             "Type": {
                 "type": "string"
             }
         }
     }
 }
+