Remove torch.cholesky overrides

[malfet]

torch.cholesky has been an alias for torch.linalg.cholesky for several years and is getting removed by pytorch/pytorch#186817

Update the repo to use torch.linalg.cholesky

Add torch.cholesky to skiplist, but check that torch.linalg.cholesky tests are still running

% python test/test_ops.py -v -k cholesky                                                              
op_db size:  697 testing:  657
test_reference_eager_cholesky_inverse_cpu_float32 (__main__.TestOpInfoCPU.test_reference_eager_cholesky_inverse_cpu_float32) ... ok
test_reference_eager_linalg_cholesky_cpu_float32 (__main__.TestOpInfoCPU.test_reference_eager_linalg_cholesky_cpu_float32) ... ok
test_reference_eager_linalg_cholesky_ex_cpu_float32 (__main__.TestOpInfoCPU.test_reference_eager_linalg_cholesky_ex_cpu_float32) ... ok

----------------------------------------------------------------------
Ran 3 tests in 0.788s

OK

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[qihqi]

thanks!

[qihqi]

Hi @malfet please click the cla/google link in the CI section and fill the form. Thanks!

[malfet]

@qihqi please have another look, force pushed a change that re-authored both commits under non-temp email, otherwise CLA would not pass.