onnxruntime

61ff403b - Add `MlasIsDynamicQGemmAvailable()` helper and use that in place of platform-specific checks (#26668)

Add `MlasIsDynamicQGemmAvailable()` helper and use that in place of platform-specific checks (#26668) ### Description <!-- Describe your changes. --> Add `MlasIsDynamicQGemmAvailable()` helper function and use that in place of platform-specific checks. ### Motivation and Context <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> Try to reduce platform-specific code.