[bug]: fixed comm_dtype in extra_large_param_to_reduce (#7660)
Fixes #7653
The extra-large params were recorded in `param.dtype` but the reducer
looks up using `comm_dtype`.
https://github.com/deepspeedai/DeepSpeed/blob/d56e847bac2853d5b8819ce176eeafff65a3798e/deepspeed/runtime/zero/stage_1_and_2.py#L1461
cc @sfc-gh-truwase
Signed-off-by: Naveenraj Kamalakannan <therealnaveenkamal@gmail.com>
Co-authored-by: Masahiro Tanaka <81312776+tohtana@users.noreply.github.com>