Add `infinity` to `cutlass::platform::numeric_limits<half_t>`

[eqy]

Fix for PyTorch build

CC @ptrblck @nWEIdia

[Skylion007]

This is the last thing blocking the torch upgrade @eqy , @thakkarV @nWEIdia @ptrblck could we get this merged?https://github.com/pytorch/pytorch/pull/131493

[thakkarV]

@hwu36 pointed out that what this PR adds already exists here: https://github.com/NVIDIA/cutlass/blob/main/include/cutlass/half.h#L588

[eqy]

That seems gated by, __CUDACC_RTC__, is that potentially an issue?

[github-actions[bot]]

This PR has been labeled inactive-30d due to no recent activity in the past 30 days. Please close this PR if it is no longer required. Otherwise, please respond with a comment indicating any updates. This PR will be labeled inactive-90d if there is no activity in the next 60 days.

[Junkai-Wu]

This change has been added in cutlass/half.h. This PR can be closed @hwu36