Support bfloat16 for Upsample2D

[darhsu]

What does this PR do?

Support bfloat16 for Upsample2D. This change is backwards compatible.

Resolves the TODO comment as PyTorch 2.1+ supports bloat16. Referencing the original PyTorch issue:
pytorch/pytorch#86679 (comment)

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Who can review?

CC: @sayakpaul @yiyixuxu

[sayakpaul]

Looks good to me!

Is it possible to add a small test for this? Our CI already has the latest PyTorch.

[darhsu]

@sayakpaul For sure, just added a test for bfloat16 by copying over test_upsample_default and resolved your comment

[sayakpaul]

Thanks a lot! @yiyixuxu WDYT?

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