[ROCM][CI] Skip fp16 bench and 2-GPU runs (#40243)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40243
rocm bench has a large backlog right now. Let's skip some tests.
Test Plan: CI
Reviewed By: ezyang
Differential Revision: D22125197
fbshipit-source-id: 330b52ce7f97af4e45c58f25bc7d57351d7c4efb
