ARM: versatile: Drop mapping IB2 module registers

As of commit 153969fd ("ARM: versatile: Drop CLCD platform data"),
the IB2 module is not accessed in the platform code, so let's remove
mapping it.

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200409222014.31828-1-robh@kernel.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>