Compatible with GPTQModel FORAMT.LLM_AWQ
Author: ZX-ModelCloud
Pull request: yes

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the og awq model support is retained for academic purposes as I still see most papers using reference og gptq and awq code rather than more modern frameworks.

GPTQModel already supports LLM AWQ FORM: https://github.com/ModelCloud/GPTQModel/pull/2252


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Comments:
@SunMarc This PR re-adds llm-awq loading support. `format.llm_awq` has been added to gpt-qmodel v5.6.2 (releasing now): https://github.com/ModelCloud/GPTQModel/releases/tag/v5.6.2

Confirmed llm-awq can use same autoawq kernel but due to the format difference (scaled_qzeros vs qzeros), we have added new `format.llm_awq` property to assist weight loading. So this PR when it detects `backend=llm-awq`, it will  converts it for compat reasons to gpt-qmodel compliant `format=llm-awq`. 

For gptq-qmodel, `format` property is used to specify tensor format which exactly the difference for llm-awq vs autoawq. `backend` is used by gpt-qmodel for kernel selection so we do not want this conflict to continue. We will submit a PR to mit/llm-awq to make sure their hf-conversion script use new `format` property and not the conflicting `backend`.



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