[pytorch] move ATen/CUDAGeneratorImpl.h to ATen/cuda (#71224)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71224
Pull Request resolved: https://github.com/facebookresearch/FBTT-Embedding/pull/19
Pull Request resolved: https://github.com/pytorch/FBGEMM/pull/860
This patch follows up D33414890 (https://github.com/pytorch/pytorch/commit/5cae40c169b3da48d2782947d072d20b7acb15d1).
This patch removes an alias header "`ATen/CUDAGeneratorImpl.h`" since it has been moved to `ATen/cuda/CUDAGeneratorImpl.h`. This change should have already been propagated.
Test Plan: Internal and external CI
Reviewed By: jianyuh
Differential Revision: D33534276
fbshipit-source-id: 368177784ec84f003aad911cf4dd4da4a6e8e3d4
