Bitfield: Setting `config.bits` to 4 or less cause `config.bits` to be set to 32

[domWalters]

Code:

{
    "config": {
        "bits": 4,
        "lanes": 1
    },
    "reg": [
        {
            "bits": 1,
            "name": "1"
        },
        {
            "bits": 1,
            "name": "2"
        },
        {
            "bits": 1,
            "name": "3"
        },
        {
            "bits": 1,
            "name": "4"
        }
    ]
}

Rendered with wavedrom editor:

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Rendered with pip install wavedrom:

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