PR #12131: [XLA:GPU] Clean code of cublasLT workspace size settings.
PR #12131: [XLA:GPU] Clean code of cublasLT workspace size settings.

Imported from GitHub PR https://github.com/openxla/xla/pull/12131


Copybara import of the project:

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2a2cc13501b2beca205cb573c21ac007e7441b0b by Shawn Wang <shawnw@nvidia.com>:

code clean

Merging this change closes #12131

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/12131 from shawnwang18:shawnw/code_clean 2a2cc13501b2beca205cb573c21ac007e7441b0b
