boards: shields: coverage_support: save memory for 54l15

Switch crypto to save memory and enable more testing at 54l15.

Signed-off-by: Piotr Kosycarz <piotr.kosycarz@nordicsemi.no>

Author: nordic-piks

boards/shields/coverage_support/boards/nrf54l15dk_nrf54l15_cpuapp.conf

@@ -17,3 +17,7 @@ CONFIG_ZTEST_STACK_SIZE=4096
 CONFIG_IPM_CONSOLE_STACK_SIZE=8092
 CONFIG_IPC_SERVICE_BACKEND_ICMSG_WQ_STACK_SIZE=4096
 CONFIG_SIZE_OPTIMIZATIONS=y
+
+# Switch from CRACEN to OBERON to save memory
+CONFIG_PSA_CRYPTO_DRIVER_OBERON=y
+CONFIG_PSA_CRYPTO_DRIVER_CRACEN=n