[nrf fromlist] samples: drivers: jesd216: Enable sample on nrf54lm20dk

Add overlay required to run the sample on
nrf54lm20dk/nrf54lm20a/cpuapp.

Upstream PR #: 92432

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

samples/drivers/jesd216/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&mx25r64 {
+	status = "okay";
+};

samples/drivers/jesd216/sample.yaml

@@ -29,6 +29,18 @@ tests:
     platform_allow: nrf52840dk/nrf52840
     integration_platforms:
       - nrf52840dk/nrf52840
+  sample.drivers.jesd216.nrf54lm20:
+    platform_allow:
+      - nrf54lm20dk/nrf54lm20a/cpuapp
+    integration_platforms:
+      - nrf54lm20dk/nrf54lm20a/cpuapp
+    harness_config:
+      fixture: external_flash
+      type: multi_line
+      ordered: true
+      regex:
+        - "sfdp-bfp ="
+        - "jedec-id ="
   sample.drivers.stm32.jesd216:
     filter: dt_compat_enabled("st,stm32-xspi-nor")
       or dt_compat_enabled("st,stm32-ospi-nor")