Revert "Expose OpenVINO batch_size similarly to TensorRT" (ultralyt…

…ics#8510)

Revert "Expose OpenVINO `batch_size` similarly to TensorRT (ultralytics#8437)"

This reverts commit da2ee39.

models/common.py

@@ -366,7 +366,6 @@ def __init__(self, weights='yolov5s.pt', device=torch.device('cpu'), dnn=False,
             if not Path(w).is_file():  # if not *.xml
                 w = next(Path(w).glob('*.xml'))  # get *.xml file from *_openvino_model dir
             network = ie.read_model(model=w, weights=Path(w).with_suffix('.bin'))
-            batch_size = network.batch_size
             executable_network = ie.compile_model(network, device_name="CPU")  # device_name="MYRIAD" for Intel NCS2
             output_layer = next(iter(executable_network.outputs))
             meta = Path(w).with_suffix('.yaml')