mailmap: add entry for Oleksandr

Map my corporate email to my personal one.

Link: https://lkml.kernel.org/r/20230419134734.454630-1-oleksandr@natalenko.name


Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>