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2698ff8b - Add `--gpu-lockdown` option to pin GPU frequency and add power limit

Add `--gpu-lockdown` option to pin GPU frequency and add power limit Summary: Use bertmaher's script P1491504558 and an option `--gpu-lockdown` to lockdown GPU frequency and power limit. Reviewed By: int3 Differential Revision: D60301004 fbshipit-source-id: ff2e303c9d6570c0938919deed9c870c2a61b6b8