Merge pull request #96 from Mbed-TLS/issue-39-follow-up

Undo temporary changes in all-helpers.sh

scripts/all-helpers.sh

@@ -68,10 +68,10 @@ helper_libtestdriver1_adjust_config() {
     fi
 
     # Enable PSA-based config (necessary to use drivers)
-    # The configuration option has been removed for 4.0. While the project and
-    # branch detection shell in shell work is not completed, just ignore the
-    # failure to set MBEDTLS_PSA_CRYPTO_CONFIG.
-    scripts/config.py set MBEDTLS_PSA_CRYPTO_CONFIG || true
+    # MBEDTLS_PSA_CRYPTO_CONFIG is a legacy setting which should only be set on 3.6 LTS branches.
+    if in_mbedtls_repo && in_3_6_branch; then
+        scripts/config.py set MBEDTLS_PSA_CRYPTO_CONFIG
+    fi
 
     # Dynamic secure element support is a deprecated feature and needs to be disabled here.
     # This is done to have the same form of psa_key_attributes_s for libdriver and library.