snippets: matter: add nrf54lm20 to power snippet

Configure power optimized snippet for nrf54lm20.

Signed-off-by: Michał Szablowski <[email protected]>

Author: doublemis1

snippets/matter-power-consumption-tests/boards/nrf54lm20dk.conf

@@ -0,0 +1,14 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+# Disable LEDs that lead to the current leakages
+CONFIG_NCS_SAMPLE_MATTER_LEDS=n
+
+# Disable watchdog that increases the sleep current
+CONFIG_NCS_SAMPLE_MATTER_WATCHDOG=n
+
+# Increase MPSL calibration period to prevent too often CPU wake-ups.
+CONFIG_MPSL_CALIBRATION_PERIOD=60000

snippets/matter-power-consumption-tests/snippet.yml

@@ -6,3 +6,6 @@ boards:
   /nrf54l15dk.*/:
     append:
       EXTRA_CONF_FILE: boards/nrf54l15dk.conf
+  /nrf54lm20dk.*/:
+    append:
+      EXTRA_CONF_FILE: boards/nrf54lm20dk.conf