[hipblaslt] Remove unused include (immintrin.h)

[benrichard-amd]

Motivation

This PR removes an unused x86 header, immintrin.h. Removing improves ROCm code portability portability(ROCm/TheRock#5518)

Technical Details

immintrin.h is included but nothing from it is ever used.

Test Plan

Build hipblaslt and run tests

Test Result

Build and tests run successfully on gfx942

Submission Checklist

• [ * Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[therock-pr-bot]

❌ PR Check — Action Required

Check	Status	Details
🌿 Branch Name	✅ Pass	—
📝 PR Title/Description	❌ Fail	Error: Title does not follow Conventional Commits style. Expected: start with a valid type (feat, fix, docs, …). Desired format: type(optional-scope): short description
⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	❌ Fail	Error: Source/code files changed without an accompanying unit test. Expected: add at least one test file named like test_<name>.py / test_<name>.cpp (or <name>_test.*). Current: code file(s) changed: projects/hipblaslt/clients/common/include/hipblaslt_math.hpp; no test file found
🔎 pre-commit	✅ Pass	—
🚫 Draft PR	🔜 To Be Enabled	—
🚩 Feature Flag	🔜 To Be Enabled	—
📊 Code Coverage	🔜 To Be Enabled	—

⚠️ 2 policy check(s) failed. Please address the issues above before this PR can be Reviewed.

🚫 Please fix the failed policies

• ❌ PR Title/Description
• ❌ Unit Test

The Not ready to Review label was added to this PR. Once all policies pass, the label is removed automatically.

📖 Need help? See the Policy FAQ for details on every check and how to fix failures.

[therock-pr-bot]

🚫 Please fix the failed policies before requesting reviews.

The following policy checks failed:

• ❌ PR Title/Description
• ❌ Unit Test

The Not ready to Review label has been added to this PR.
Once all policies pass, the label will be removed automatically.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

❌ Your project status has failed because the head coverage (76.84%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9293   +/-   ##
========================================
  Coverage    65.07%   65.07%           
========================================
  Files         2685     2685           
  Lines       422262   422262           
  Branches     62741    62741           
========================================
  Hits        274750   274750           
  Misses      126793   126793           
  Partials     20719    20719           

Flag	Coverage Δ		*Carryforward flag
TensileLite	35.05% <ø> (ø)		Carriedforward from a2799c7
hipBLAS	90.81% <ø> (ø)		Carriedforward from a2799c7
hipBLASLt	34.69% <ø> (ø)
hipCUB	82.68% <ø> (ø)		Carriedforward from a2799c7
hipDNN	86.12% <ø> (ø)		Carriedforward from a2799c7
hipFFT	50.88% <ø> (ø)		Carriedforward from a2799c7
hipRAND	76.12% <ø> (ø)		Carriedforward from a2799c7
hipSOLVER	69.18% <ø> (ø)		Carriedforward from a2799c7
hipSPARSE	86.10% <ø> (ø)		Carriedforward from a2799c7
rocBLAS	47.91% <ø> (ø)		Carriedforward from a2799c7
rocFFT	51.65% <ø> (ø)		Carriedforward from a2799c7
rocRAND	57.02% <ø> (ø)		Carriedforward from a2799c7
rocSOLVER	76.84% <ø> (ø)		Carriedforward from a2799c7
rocSPARSE	72.37% <ø> (ø)		Carriedforward from a2799c7
rocThrust	91.36% <ø> (ø)		Carriedforward from a2799c7

*This pull request uses carry forward flags. Click here to find out more.

Files with missing lines	Coverage Δ
...ipblaslt/clients/common/include/hipblaslt_math.hpp	0.00% <ø> (ø)

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