PR #10372: [GPU] Change cuDNN GEMM fusion flag type to an integer.
PR #10372: [GPU] Change cuDNN GEMM fusion flag type to an integer.

Imported from GitHub PR https://github.com/openxla/xla/pull/10372

This will allow enabling more fusions in parallel with rolling them out by default.
Copybara import of the project:

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4df569ff5e204f1b2025863f5e1f8dba2a5d8b95 by Ilia Sergachev <isergachev@nvidia.com>:

[GPU] Change cuDNN GEMM fusion flag type to an integer.

This will allow enabling more fusions in parallel with rolling them out by default.

Merging this change closes #10372

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10372 from openxla:cudnn_fusion_level 4df569ff5e204f1b2025863f5e1f8dba2a5d8b95
