Fix typo that caused CBMA not to find upper CBMA private key path

-typo caused enum instead of string to be passed as key path
-SECO-7892

modules/sc-mesh-secure-deployment/src/nats/src/cbma_adaptation.py

@@ -51,7 +51,7 @@ def __init__(
         self.__cbma_certs_path = Constants.ECDSA_BIRTH_FILEBASED.value
         self.__upper_cbma_certs_path = Constants.DOWNLOADED_RSA_CERTS_PATH.value
         self.__upper_cbma_ca_cert_path = Constants.DOWNLOADED_UPPER_CBMA_CA_CERT.value
-        self.__upper_cbma_key_path = Constants.RSA_BIRTH_KEY
+        self.__upper_cbma_key_path = Constants.RSA_BIRTH_KEY.value
         self.__lower_cbma_controller = None
         self.__upper_cbma_controller = None
         self.__lower_cbma_interfaces: List[Interface] = []