Add MBED_CONF_RTOS_PRESENT guard to enable USBCDC_ECM class device only for MBED OS full profile.

drivers/USBCDC_ECM.h

@@ -18,6 +18,7 @@
 #ifndef USBCDC_ECM_H
 #define USBCDC_ECM_H
 
+#if defined(MBED_CONF_RTOS_PRESENT)
 #include "USBDescriptor.h"
 #include "USBDevice.h"
 #include "ByteBuffer.h"
@@ -275,5 +276,5 @@ private:
 };
 
 /** @}*/
-
+#endif // defined(MBED_CONF_RTOS_PRESENT)
 #endif

drivers/source/usb/USBCDC_ECM.cpp

@@ -14,7 +14,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+#if defined(MBED_CONF_RTOS_PRESENT)
 #include <stdint.h>
 #include "USBCDC_ECM.h"
 #include "EndpointResolver.h"
@@ -556,3 +556,4 @@ void USBCDC_ECM::_bulk_out_callback()
 
     read_start(_bulk_out, _bulk_buf, MAX_PACKET_SIZE_BULK);
 }
+#endif // defined(MBED_CONF_RTOS_PRESENT)