remove accscalar from i0 and i0e (#67048)
Summary:
Removes some of the half math ops to make https://github.com/pytorch/pytorch/issues/64023 possible.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67048
Reviewed By: mruberry
Differential Revision: D31847249
Pulled By: ngimel
fbshipit-source-id: 8385aacd846bb990e368ff336eb346d847af70b9
