boards: shields: coverage_support: support also lm20dk

Missing after pdk->dk.
Keeping pdk until board will be totaly removed.

Signed-off-by: Piotr Kosycarz <[email protected]>

Author: nordic-piks

boards/shields/coverage_support/boards/nrf54lm20dk_nrf54lm20a_cpuapp.conf

@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+CONFIG_FORCE_COVERAGE=y
+CONFIG_COVERAGE_GCOV=y
+CONFIG_COVERAGE_GCOV_HEAP_SIZE=0
+CONFIG_MAIN_STACK_SIZE=4096
+CONFIG_TEST_EXTRA_STACK_SIZE=2048
+CONFIG_ISR_STACK_SIZE=5120
+CONFIG_IDLE_STACK_SIZE=4096
+CONFIG_PRIVILEGED_STACK_SIZE=2048
+CONFIG_SHELL_STACK_SIZE=4096
+CONFIG_ZTEST_STACK_SIZE=4096
+CONFIG_IPM_CONSOLE_STACK_SIZE=8192
+CONFIG_IPC_SERVICE_BACKEND_ICMSG_WQ_STACK_SIZE=4096
+CONFIG_SIZE_OPTIMIZATIONS=y

boards/shields/coverage_support/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+&uart20 {
+	hw-flow-control;
+};