[MPS] Enable adaptive avg pool 2d with larger output size (#85726)
* Handle adpative pool 2d forward and backward when ouptut size is larger than input size
* Disallow larger output size if not a multiple of input size
Fixes: https://github.com/pytorch/pytorch/issues/80732
Pull Request resolved: https://github.com/pytorch/pytorch/pull/85726
Approved by: https://github.com/malfet
