Add xpu device type to torch dispatch overload (#96849)
# Motivate
Add XPU device type to CppFunction dispatch overload function.
We previously omitted it.
# Solution
Add XPU device type.
# Additional
This list is synchronized with the k-constants in c10/core/DeviceType.h
Pull Request resolved: https://github.com/pytorch/pytorch/pull/96849
Approved by: https://github.com/ezyang
