Op info test for `nn.functional.softmin .. nonzero_static`

[qihqi]

Fix the Op info test for nn.functional.softmin .. nonzero_static

1. Find the lines 258 to 262 of test_ops.py and remove nn.functional.softmin .. nonzero_static from skip_list
2. Run op_info test with pytest test/test_ops.py
3. Fix the failure.

Please refer to this guide as guide to fix:

Also refer to these PRs:

• https://github.com/pytorch/xla/pull/7343
• https://github.com/pytorch/xla/pull/7312
• https://github.com/pytorch/xla/pull/7325