Added missing VSX dispatch for cholesky_inverse (#51562)
Summary:
It was overlooked that vsx dispatch is also needed for cholesky_inverse cpu dispatch.
See https://github.com/pytorch/pytorch/pull/50269#issuecomment-771688180
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51562
Reviewed By: H-Huang
Differential Revision: D26199581
Pulled By: anjali411
fbshipit-source-id: 5d02c6da52ce1d2e9e26001f5d4648a71dd0e829
