Remove dynamo_timed fwd_only param (#140993)
Summary:
It's ignored; remove it
X-link: https://github.com/pytorch/pytorch/pull/140993
Approved by: https://github.com/ezyang
Reviewed By: izaitsevfb
Differential Revision: D66221753
Pulled By: masnesral
fbshipit-source-id: 74f2947d25dd5c7156edbd6a9ffe182f0180266f
