Add recursive flag to submodule update

With the addition of tf-psa-crypto as a submodule, which itself has
framework as a submodule, git submodule calls now need to be recursive

Signed-off-by: Paul Elliott <[email protected]>

Author: paul-elliott-arm

coverity/push_coverity_scan.py

@@ -174,7 +174,8 @@ def build_mbedtls(logger: logging.Logger, mbedtls_dir: pathlib.Path, tools_dir:
                      check=True)
         logger.log(logging.INFO, result.stdout.decode("utf-8"))
 
-        result = run(['git', 'submodule', 'update', '--init'], capture_output=True, check=True)
+        result = run(['git', 'submodule', 'update', '--init', '--recursive'], capture_output=True,
+                      check=True)
         logger.log(logging.INFO, result.stdout.decode("utf-8"))