[TRTLLM-5825][fix] Fix torch LoRA TP

[amitz-nv]

Description

1. The torch LoRA TP tests in unittest/llmapi/test_llm_multi_gpu_pytorch.py were not running so far on CI because they use just 2 GPUs, while the DGX has 4, and the pytest command line filtered only the tests marked with @pytest.mark.gpu4, so I fixed the pytest command line to also run tests marked with @pytest.mark.gpu2.
2. Fixed ModelConfig.get_bindings_model_config method calculations to be like gptJsonConfig.cpp::createModelConfig, as stated in get_bindings_model_config docstring.

Test Coverage

Torch LoRA TP>1 tests:

1. tests/unittest/llmapi/test_llm_multi_gpu_pytorch.py::test_llama_v2_13b_lora_tp2
2. tests/unittest/llmapi/test_llm_multi_gpu_pytorch.py::test_llama_7b_multi_lora_tp2

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[amitz-nv]

/bot run

[tensorrt-cicd]

PR_Github #9405 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #9405 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #6901 completed with status: 'SUCCESS'
Pipeline passed with automatic retried tests. Check the rerun report for details.

[shaharmor98]

LTGM