[BE] Cleanup UnaryOpsKernel.cpp (#52444)
Summary:
Delete unused `dispatchtypes` of `IMPLEMENT_FLOAT_KERNEL` and `IMPLEMENT_COMPLEX_KERNEL`
Move common part of above-mentioned macros into `IMPLEMENT_ITERATOR_LAMBDA` macro
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52444
Reviewed By: walterddr
Differential Revision: D26517032
Pulled By: malfet
fbshipit-source-id: f03f89602f14fb513c66f3f2a96596e4c1e4cd16
