Revert "Use opmath_type for CUDA logcumsumexp (#83425)"
This reverts commit 06a64f7eaa47ce430a3fa61016010075b59b18a7.
Reverted https://github.com/pytorch/pytorch/pull/83425 on behalf of https://github.com/huydhn due to This break ROCm trunk test https://hud.pytorch.org/pytorch/pytorch/commit/06a64f7eaa47ce430a3fa61016010075b59b18a7
