sunxi: add mele a210 (a10s)

Signed-off-by: Luc Verhaegen <libv@skynet.be>
sunxi:boards: add iNet 86VS

Signed-off-by: Michal Suchanek <hramrach@gmail.com>
sunxi:boards: add prestigio pmp3670b

Signed-off-by: Luc Verhaegen <libv@skynet.be>