Revert "[inductor] Register an op for mm_plus_mm (#104835)" (#105150)
This reverts commit 9c46a1620c99626ee9db01985a569ba79888508b.
Actual revert referenced in https://github.com/pytorch/pytorch/pull/105149
#104835 is causing internal builds to fail
Pull Request resolved: https://github.com/pytorch/pytorch/pull/105150
Approved by: https://github.com/atalman
