Port lerp to structured kernels (#68924)
Summary:
Ref https://github.com/pytorch/pytorch/issues/55070
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68924
Reviewed By: jbschlosser
Differential Revision: D32697409
Pulled By: bdhirsh
fbshipit-source-id: b098533e46f8bdbb995c76db0e6a124ab2b076b8
