Fix aicluster ci (#1250)
Summary:
Update the name of the platform to be consistent with other workflows.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1250
Reviewed By: erichan1
Differential Revision: D40436442
Pulled By: xuzhao9
fbshipit-source-id: 9e6fb4c755d171e58c6df2a2e8cde3a6a9af8302
