MAINTAINERS: nfc mailing lists are subscribers-only

It looks as if the MAINTAINERS entries for the nfc mailing list
should be updated as I just got a "rejected" bounce from the nfc list.

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Your message to the Linux-nfc mailing-list was rejected for the following
reasons:

The message is not from a list member
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Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>