[nrf noup] boot: zephyr: boards: nrf54lm20pdk

adding default configs.

Signed-off-by: Mateusz Michalek <[email protected]>
(cherry picked from commit ec52537)

Author: michalek-no

boot/zephyr/boards/nrf54lm20pdk_nrf54lm20a_cpuapp.conf

@@ -0,0 +1,16 @@
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+CONFIG_BOOT_MAX_IMG_SECTORS=256
+
+# Ensure that the SPI NOR driver is disabled by default
+CONFIG_SPI_NOR=n
+
+# TODO: below are not yet supported and need fixing
+CONFIG_FPROTECT=n
+
+CONFIG_BOOT_WATCHDOG_FEED=n
+
+CONFIG_PSA_CRYPTO_DRIVER_CRACEN=n
+CONFIG_PSA_CRYPTO_DRIVER_OBERON=y