[nrf noup] tests: crypto: Add overlay for new board

Add ENTROPY_GENERATOR=y in overlay
This fixes an error where a trng source is not included in ncs.
Addition of this for other L series devices is also a noup.

Signed-off-by: Dag Erik Gjørvad <[email protected]>

Author: degjorva

tests/crypto/mbedtls_psa/boards/nrf54ls05dk_nrf54ls05b_cpuapp.conf

@@ -0,0 +1,6 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+CONFIG_ENTROPY_GENERATOR=y