Update adjust-config.sh to enable persistent keys

In adjust-config.h, set and unset Mbed Crypto storage configuration options
in order to use persistent keys with PSA ITS storage.

Author: itayzafrir

features/mbedtls/importer/adjust-config.sh

@@ -140,3 +140,8 @@ conf unset MBEDTLS_SSL_TRUNCATED_HMAC
 
 conf unset MBEDTLS_PLATFORM_TIME_TYPE_MACRO
 
+# The following configurations are a needed for Mbed Crypto submodule.
+# They are related to the persistent key storage feature.
+conf set MBEDTLS_PSA_CRYPTO_STORAGE_C
+conf set MBEDTLS_PSA_CRYPTO_STORAGE_ITS_C
+conf unset MBEDTLS_PSA_CRYPTO_STORAGE_FILE_C