another pegasus usb net device

This one removes trailing whitespace in pegasus.h and more importantly
adds new Pegasus compatible device.

Signed-off-by: Julian Brown <julian@codesourcery.com>
Signed-off-by: Petko Manolov <petkan@nucleusys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>