mailmap: Add entry for old intel email

Fix old email to avoid bouncing email from net/drivers and older
netdev work. Anyways my @intel email hasn't been active for years.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/r/20230717173306.38407-1-john.fastabend@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>