MAINTAINERS: net: macb: add Claudiu as co-maintainer

I would like that Claudiu becomes co-maintainer of the Cadence macb
driver. He's already participating to lots of reviews and enhancements
to this driver and knows the different versions of this controller.

Signed-off-by: Nicolas Ferre <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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