.mailmap: update e-mail address for Eugen Hristev

Update e-mail address.

Link: https://lkml.kernel.org/r/20230119072229.99603-1-eugen.hristev@collabora.com


Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>