mailmap: add entry for Senozhatsky

Consolidate and map all addresses to a single one.

Link: https://lkml.kernel.org/r/20250707075243.858895-1-senozhatsky@chromium.org


Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>