ddaa905 ("arm: mvebu: Add DM (driver model) support") removed the
assignment of the gd pointer, but kept the (now superfluous) declaration
of the gd pointer.
Remove this declaration.
Signed-off-by: Reinhard Pfau <pfau@gdsys.de> Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Stefan Roese <sr@denx.de>