ARM: integrator: delete SC mapping on the CP

The Integrator/CP does not use the address space defined as
used by the Integrator/AP system controller, it's just unused
memory. So just delete this static mapping from the CP static
mapping table.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>