samples: mgmt: hawkbit: no BOOT_MAX_IMG_SECTORS for stm32h573i_dk

Reverts commit 5700ffe.
Not required anymore as the CONFIG_BOOT_MAX_IMG_SECTORS
is fixed by the mcuboot at 4096.
Add the corresponding overlay file.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

samples/subsys/mgmt/hawkbit/boards/stm32h573i_dk.overlay

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Define the device, controller and partition to be the external memory
+ * for running the application in external NOR from MCUboot
+ */
+/ {
+	chosen {
+		zephyr,flash = &mx25lm51245;
+		zephyr,flash-controller = &mx25lm51245;
+	};
+};

samples/subsys/mgmt/hawkbit/sample.yaml

@@ -17,8 +17,6 @@ tests:
   sample.net.hawkbit.default: {}
   sample.net.hawkbit.sysbuild:
     sysbuild: true
-    extra_args:
-      - platform:stm32h573i_dk/stm32h573xx:mcuboot_CONFIG_BOOT_MAX_IMG_SECTORS=128
   sample.net.hawkbit.manual:
     extra_configs:
       - CONFIG_HAWKBIT_MANUAL=y