MAINTAINERS: Assign maintainer to Mellanox mlx4 core and IB drivers

The driver was written originally by Roland Dreier, currently there's
no official maintainer. Yishai steps in as maintainer.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Roland Dreier <roland@kernel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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