Change the maintainer for Allwinner A10 to myself as Li Guang's mail
address bounces. While at it, extend the file pattern for the entry to
include allwinner_emac.[ch].

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Message-id: 1442865156-5598-1-git-send-email-b.galvani@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>