[inductor] Switch inductor_prims._bucketize over to aten.bucketize (#106658)
inductor_prims._bucketize was added while we worked on hardening the inductor lowering. Now the lowering should be sufficiently tested and should have good enough perf (https://github.com/pytorch/pytorch/pull/104456) - so we can remove the temporary `inductor_prims._bucketize` op and move the lowerings to the `aten.bucketize` op.
Note that we haven't added a CPU implementation yet.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106658
Approved by: https://github.com/eellison
