schemas: legacy: remove 'MinReading', 'MaxReading'

'MinReading' and 'MaxReading' are no longer required as part of
'Aggregate' schema and can be dropped from it.

Tested: Schema Validator Pass

Change-Id: Ic43751d62f5cd0046a4fb0b69c2fccc998c27ad7
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/schemas/legacy.json b/schemas/legacy.json
index 0d7e803..6210348 100644
--- a/schemas/legacy.json
+++ b/schemas/legacy.json
@@ -844,12 +844,6 @@
                 "Labels": {
                     "$ref": "#/$defs/Types/Labels"
                 },
-                "MaxReading": {
-                    "$ref": "#/$defs/Types/MaxReading"
-                },
-                "MinReading": {
-                    "$ref": "#/$defs/Types/MinReading"
-                },
                 "Polling": {
                     "$ref": "#/$defs/Types/Polling"
                 },