GuruPlug Standard: 1 Gb Ethernet, 2 USB 2.0
GuruPlug Plus: 2 Gb Ethernet, 2 USB 2.0, 1 eSATA, 1 uSD slot

References:
http://www.globalscaletechnologies.com/t-guruplugdetails.aspx
http://plugcomputer.org

This patch is for GuruPlug Plus, but it supports Standard version
as well.
Signed-off-by: Siddarth Gore <gores@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>