Revert tag desc.json renaming

Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: I3620799a01784865b3de1407e70e02582966f6d1
diff --git a/scripts/convert2conformance/convert2conformance.py b/scripts/convert2conformance/convert2conformance.py
index 555cb50..adb163f 100755
--- a/scripts/convert2conformance/convert2conformance.py
+++ b/scripts/convert2conformance/convert2conformance.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright (c) 2021-2022, ARM Limited.
+# Copyright (c) 2021-2023, ARM Limited.
 # SPDX-License-Identifier: Apache-2.0
 """This script converts generated tests into conformance tests.
 
@@ -218,7 +218,7 @@
 
     # Add tags (if any)
     if tags is not None:
-        test_desc["tags"] = tags
+        test_desc["tag"] = tags
 
     return test_desc
 
diff --git a/scripts/schemavalidation/desc.schema.json b/scripts/schemavalidation/desc.schema.json
index 226fc68..d7447b1 100644
--- a/scripts/schemavalidation/desc.schema.json
+++ b/scripts/schemavalidation/desc.schema.json
@@ -75,7 +75,7 @@
                 "type": "string"
             }
         },
-        "tags": {
+        "tag": {
             "description": "list of string tags that can be used for test filtering",
             "type": "array",
             "items": {