* Use the unified naming for math functions on host and HIP kernel
* Corresponding change/simplification in reduction host/profiler/examples due to unified math functions renaming
* Renaming GetReductionZeroVal() to GetIdentityValue()
* Tiny renaming in profile_reduce_impl.hpp
* More renaming in profile_reduce_impl.hpp
* Replace zeroVal by identiyVal
* Remove ck_ prefix in the naming of ck::math provided functions
* Add example for computing LayerNorm mean and meansquare
* Refactor the pool2d_fwd example and add example for float type testing
* Revert "Add example for computing LayerNorm mean and meansquare"
This reverts commit df52e6f9d8.
* Tiny fix in pool2d_fwd_common.hpp
