MAINTAINERS: remove bouncing pkaustub@cisco.com from enic

pkaustub@cisco.com is bouncing, remove it.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Christian Benvenuti <benve@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>