MAINTAINERS: add entry for Dynamic Interrupt Moderation

Signed-off-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Tal Gilboa <talgi@mellanox.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>