Removed fallback for lm_head op

[PenghuiCheng]

Type of Change

feature
No API changed

Description

Removed fallback of lm_head op for WOQ

Expected Behavior & Potential Risk

Don't fallback lm_head when weight-only quantization.

How has this PR been tested?

Local tested

[github-actions]

⛈️ Required checks status: Has failure 🔴

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🟢 Format Scan Tests workflow

Check ID	Status	Error details
format-scan (pylint)	success		✅
format-scan (bandit)	success		✅
format-scan (cloc)	success		✅
format-scan (cpplint)	success		✅

These checks are required after the changes to intel_extension_for_transformers/transformers/llm/quantization/utils.py.

🔴 Optimize Unit Test workflow

Check ID	Status	Error details
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optimize-unit-test-PR-test	failure	download	❌
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🟢 NeuralChat Unit Test

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neuralchat-unit-test-baseline	success		✅
neuralchat-unit-test-PR-test	success		✅
Generate-NeuralChat-Report	success		✅

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engine-unit-test-PR-test	success		✅
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call-inference-mpt-7b-chat / inference test	queued		⌛

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