[inductor] Don't import torchvision (#93027)
Fixes #93019
Since PyTorch regularly breaks binary compatibility, `torchvision` must be
compiled with the exact same version of PyTorch. If not, then importing it may
cause mysterious failures at runtime due to binary incompatibility.
This fixes the issue by delaying the `make_fallback` call for
`torchvision.roi_align` until the operator appears in a graph being lowered, by
which point the user must have imported torchvision themself.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/93027
Approved by: https://github.com/jansel
