fvp: migrate FVP to 11.28.23 release

Migrate FVP models in CI To 11.28.23. The following done part
of migration efforts.

- Move std, revc, base, rd_1_ae, tc4 FVP's to use latest FVP's.
- Some FVP's have removed x4 in the file names, so modify
  them to have NUM_CORES=4 model param. But retain the config names
  with x4 indicating they are used as quad core configuration.
- Remove FVP Cortex-A72x4-A53x4 test and model usage, this model
  is been deprecated in 11.28.23 release, But we do have
  Cortex-A73x4-A53x4 and in use in CI so we are not missing out
  any coverage from heterogeneous Big.Little combination.

Change-Id: Id50a01a050a0f04eb8c4f314ce3d17a247a76e7c
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/utils.sh b/utils.sh
index f65654f..84b5a41 100644
--- a/utils.sh
+++ b/utils.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019-2024, Arm Limited. All rights reserved.
+# Copyright (c) 2019-2025, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -542,12 +542,8 @@
 jenkins_url="${JENKINS_PUBLIC_URL%/*}"
 jenkins_url="${jenkins_url:-https://ci.trustedfirmware.org/}"
 
-# Model revisions
-model_version_11_24="${model_version:-11.24}"
-model_build_11_24="${model_build:-24}"
-
-model_version="${model_version:-11.26}"
-model_build="${model_build:-11}"
+model_version="${model_version:-11.28}"
+model_build="${model_build:-23}"
 model_flavour="${model_flavour:-Linux64_GCC-9.3}"
 
 # Model snapshots from filer are not normally not accessible from developer