[platform][common] Add ota.gni to be reused by platform layer

List some OTA files in an organized manner to avoid duplication in other
gn files.

Signed-off-by: marius-alex-tache <marius.tache@nxp.com>

Author: marius-alex-tache

src/platform/nxp/common/ota/ota.gni

@@ -0,0 +1,36 @@
+# Copyright (c) 2025 Project CHIP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import("//build_overrides/nxp_sdk.gni")
+import("${nxp_sdk_build_root}/nxp_sdk.gni")
+
+ota_root = get_path_info(".", "abspath")
+
+ota_sources = [
+    "${ota_root}/OTAImageProcessorImpl.cpp",
+    "${ota_root}/OTAImageProcessorImpl.h",
+    "${ota_root}/OTATlvProcessor.cpp",
+    "${ota_root}/OTATlvProcessor.h",
+    "${ota_root}/OTAFirmwareProcessor.cpp",
+    "${ota_root}/OTAFirmwareProcessor.h",
+    "${ota_root}/OTAHooks.cpp",
+]
+
+if (nxp_use_factory_data && nxp_enable_ota_factory_data_processor) {
+    ota_sources += [
+        "${ota_root}/OTAFactoryDataProcessor.cpp",
+        "${ota_root}/OTAFactoryDataProcessor.h",
+    ]
+}