[ACR] use AZ_IOT_ADU_CLIENT_AGENT_MODEL_ID

examples/Azure_IoT_Adu_ESP32/Azure_IoT_Adu_ESP32.ino

@@ -63,7 +63,7 @@
 #define SAMPLE_MQTT_PAYLOAD_LENGTH 1024
 
 // ADU Values
-#define ADU_PPV_DTMI "dtmi:azure:iot:deviceUpdateContractModel;2"
+#define ADU_PPV_DTMI AZ_IOT_ADU_CLIENT_AGENT_MODEL_ID
 #define ADU_DEVICE_SHA_SIZE 32
 #define ADU_SHA_PARTITION_READ_BUFFER_SIZE 32
 #define HTTP_DOWNLOAD_CHUNK 4096