MAINTAINERS: fix mailing list entries for ARM/Palm devices

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Sergey Lapin <slapin@ossfans.org>
Acked-by: Tomas Cech <sleep_walker@suse.cz>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>