Current nmk_pinctrl driver is not PRCMU dependent anymore, so it needs
its own DT address resources to work properly, as done for
platform_device in:

f4828336 ARM: ux500: add PRCM register base for pinctrl
Signed-off-by: NFabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>