powerpc/mpc85xx: Add board support for ucp1020

New QorIQ p1020 based board support from Arcturus Networks Inc.
http://www.arcturusnetworks.com/products/ucp1020/



Signed-off-by: Michael Durrant <mdurrant@arcturusnetworks.com>
Signed-off-by: Oleksandr G Zhadan <oleks@arcturusnetworks.com>
[York Sun: remove patman tags from commit message]
Reviewed-by: York Sun <yorksun@freescale.com>