[side-effect]Fix param `--cache-max-entry-count` is not taking effect (#1758)

[QwertyJack]

Motivation

The --cache-max-entry-count parameter is not working correctly, causing GPU RAM to be exceeded unexpectedly.

Modification

Add an initialization step immediately following the creation of the default TurbomindModelConfig object.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit tests to ensure the correctness.
3. If the modification has a dependency on downstream projects of a newer version, this PR should be tested with all supported versions of downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[lvhan028]

Sorry, this issue is brought by my PR #1702

[lvhan028]

The following tc failed

def test_turbomind_from_hf():
    model_path = 'internlm/internlm2-chat-7b'
    engine_config = TurbomindEngineConfig(model_format='hf',
                                          tp=2,
                                          session_len=4000,
                                          max_batch_size=100,
                                          cache_max_entry_count=0.5,
                                          quant_policy=8,
                                          rope_scaling_factor=3.0,
                                          use_logn_attn=True,
                                          max_prefill_iters=64,
                                          num_tokens_per_iter=256)

    output_model_name, cfg = get_output_model_registered_name_and_config(model_path, model_format='hf', group_size=0)
    config = TurbomindModelConfig.from_engine_config(engine_config)
    config.update(cfg)

    assert(config.tensor_para_size == engine_config.tp)
    assert(config.session_len == engine_config.session_len)
    assert(config.max_batch_size == engine_config.max_batch_size)
    assert(config.cache_max_entry_count == engine_config.cache_max_entry_count)
    assert(config.quant_policy == engine_config.quant_policy)
    assert(config.rope_scaling_factor == engine_config.rope_scaling_factor)
    assert(config.use_logn_attn == engine_config.use_logn_attn)
    assert(config.max_prefill_iters == engine_config.max_prefill_iters)
    assert(config.num_tokens_per_iter == engine_config.num_tokens_per_iter)