QNN Backend: Enable QualComm SM8850 targets

[yinrun]

Add SM8850 for QualComm Snapdragon 8 Elite Gen 5.

Summary

Fixes #15986

Test plan

python -m examples.qualcomm.oss_scripts.llama.llama -b build-android -m SM8850 --temperature 0 --model_mode kv --max_seq_len 512 --prefill_ar_len 64 --decoder_model qwen3-0_6b --prompt "你好，请介绍一
下人工智能" --compile_only

[pytorch-bot]

🔗 Helpful Links

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[meta-cla]

Hi @yinrun!

Thank you for your pull request and welcome to our community.

Action Required

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[shewu-quic]

Thanks for contribution.
Could you please also add SM8850 in README.md?

Thanks

[cccclai]

Thank you for contributing! Can you also sign the CLA as described in the comment here

Hi @yinrun!

Thank you for your pull request and welcome to our community.

Action Required

In order to merge any pull request (code, docs, etc.), we require contributors to sign our Contributor License Agreement, and we don't seem to have one on file for you.

Process

In order for us to review and merge your suggested changes, please sign at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need to sign the corporate CLA.

Once the CLA is signed, our tooling will perform checks and validations. Afterwards, the pull request will be tagged with CLA signed. The tagging process may take up to 1 hour after signing. Please give it that time before contacting us about it.

If you have received this in error or have any questions, please contact us at [email protected]. Thanks!

[yinrun]

Thanks for contribution. Could you please also add SM8850 in README.md?

Thanks

Okay, I have already add "Snapdragon 8 Elite Gen 5" in section Supported Chipset.

@shewu-quic

[yinrun]

and we don't seem to have one on file for you.

It's done. Thanks for the reminder.

@cccclai