[structured kernels] Port `amin` to structured kernels. (#73581)
Summary:
Hi,
The PR follows a part of https://github.com/pytorch/pytorch/issues/55070.
cc: ailzhang bdhirsh hameerabbasi kshitij12345
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73581
Reviewed By: dagitses
Differential Revision: D34581466
Pulled By: bdhirsh
fbshipit-source-id: 44ff2e16e009d1bda31e934220e7b07e27f635ef
(cherry picked from commit d8037bd6a082095f93503988966b3dbedc6c905e)
