Qualcomm AI Engine Direct - Optimize performance of pcq embedding

[shewu-quic]

Summary:

• Change pcq embedding pattern for backend optimization
  • Note that it is supported after QNN 2.48

Test plan

python3 backends/qualcomm/tests/test_qnn_delegate.py TestQNNQuantizedOperator.test_qnn_backend_embedding_per_channel --build_folder  build-android  --host {HOST} --device {DEVICE}   --soc_model SM8850  -a {ARTIFACTS} 

[pytorch-bot]

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[shewu-quic]

Hi @psiddh,
This PR is to optimize performance for PCQ embedding on HTP.
Could you please have a look?
Thanks,
Hutton