Back out "[c2] register cuda op for LpNorm (fallback)"
Summary: Original commit changeset: 573419e5a8da
Test Plan: D21562485 breaks CI build. Unlanding
Reviewed By: olittle
Differential Revision: D21588831
fbshipit-source-id: 6dda4b71904d7765f32f570f9722e4a9a6cbc97b
