snippets: wifi-enterprise: Store certificates in Protected storage

Add config options required for storing certificates in protected
storage, and to free up space of ROM to accommodate the additional
features that are enabled for TFM.

Signed-off-by: Ravi Dondaputi <ravi.dondaputi@nordicsemi.no>

Author: rado17

snippets/wifi-enterprise/snippet.yml

@@ -6,3 +6,6 @@ boards:
   /.*/nrf.*/cpuapp/:
     append:
       EXTRA_CONF_FILE: wifi-enterprise-nrf.conf
+  /.*/nrf.*/cpuapp/ns/:
+    append:
+      EXTRA_CONF_FILE: wifi-enterprise-nrf-ns.conf

snippets/wifi-enterprise/wifi-enterprise-nrf-ns.conf

@@ -0,0 +1,8 @@
+# For TLS and X.509 processing MbedTLS needs large heap size and using separate heap
+# for MbedTLS gives us more control over the heap size.
+CONFIG_MBEDTLS_HEAP_SIZE=75000
+CONFIG_LTO=y
+CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
+CONFIG_WIFI_CREDENTIALS_RUNTIME_CERTIFICATES=y
+CONFIG_WIFI_SHELL_RUNTIME_CERTIFICATES=y
+CONFIG_TLS_CREDENTIALS_BACKEND_PROTECTED_STORAGE=y