[pruning]add dropout to list of supported activation functions

[UsingtcNower]

Summary:
Add nn.Dropout and F.dropout to list of suppported activation functions

Test Plan:

python test/test_ao_sparsity.py -- TestBaseSparsifier

cc @kit1980 @andrewor14 @jcaip Could you please help to review this tiny change?

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[jcaip]

Hey @UsingtcNower thank you for the change :) would you mind making this change in torchao instead? We're looking to maybe move this functionality from core to torchao so I want to start collecting all updates there so the eventual integration is easier.

The corresponding line would be here

[UsingtcNower]

suppported activation functions

Hi @jcaip thanks very much for your reply :) and thanks for providing the excellent torchao. I hava sync this tiny change to torchao with here, could you please help to review it?

[jcaip]

Closing as we're consolidating in torchao see here for context.