gpio: madera: Use local copy of pdata

A local copy of the pdata exists and it should be used rather than
pulling a fresh copy.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20190722090748.20807-2-ckeepax@opensource.cirrus.com


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