explicitly provide memory format when calling to clone() at SortingKthValue.cu
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/28666
Test Plan: Imported from OSS
Differential Revision: D18333371
Pulled By: ifedan
fbshipit-source-id: 11d4bbdaf8e57c97a1c47181ce7e953f2ad5b49e
