at86rf230: add at86rf230_device_id table

This patch adds a at86rf230_device_id table to offers various module
aliases.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reported-by: Varka Bhadram <varkabhadram@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>