iot2050-firmware-update: Remove OS dependency from backup pacakge

Simplify the firmware rollback process by removing the OS version check
from the backup package.

Previously, the backup function would attempt to calculate a min_version
for the target_os. This created an unnecessary dependency, potentially
complicating rollbacks.

Signed-off-by: Li Hua Qian <huaqian.li@siemens.com>

Author: huaqianli

meta-example/recipes-app/iot2050-firmware-update/files/iot2050-firmware-update.tmpl

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (c) Siemens AG, 2020-2024
+# Copyright (c) Siemens AG, 2020-2026
 #
 # Authors:
 #  Chao Zeng <chao.zeng@siemens.com>
@@ -514,17 +514,9 @@ class FirmwareUpdate():
                     file.seek(0)
                     file_content = file.read()
                 elif self.tarball.FIRMWARE_TYPES[2] == firmware_type:
-                    with open("/sys/firmware/devicetree/base/model", "r") as model_f, \
-                        open("/etc/os-release", "r") as release_f:
-                        for line in release_f.readlines():
-                            key, value = line.rstrip("\n").split("=")
-                            if "BUILD_ID" in key:
-                                break
+                    with open("/sys/firmware/devicetree/base/model", "r") as model_f:
                         target_board = model_f.read().replace("\u0000", "")
                     tmpl_json['firmware'][0]['target_boards'] = target_board
-                    tmpl_json['target_os'][0]['min_version'] = \
-                        value.replace('"', '')[:1] + \
-                        tmpl_json['target_os'][0]['min_version'][1:]
                     file_content = bytes(json.dumps(tmpl_json, indent=4), "utf8")
                 else:
                     raise UpgradeError("Wrong Firmware Type!")

meta-example/recipes-app/iot2050-firmware-update/files/update.conf.json.tmpl

@@ -7,13 +7,6 @@
             "target_boards": ""
         }
     ],
-    "target_os": [
-        {
-            "type": "Example Image",
-            "key": "BUILD_ID",
-            "min_version": "V01.01.01"
-        }
-    ],
     "suggest_preserved_uboot_env": [
         "boot_targets"
     ]