RDMA/rxe: Rename rxe_atomic_reply to atomic_reply

It's better to use the unified naming format.

Link: https://lore.kernel.org/r/20220705145212.12014-2-yangx.jy@fujitsu.com


Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>