pinctrl: spear: switch plgpio to irqchip helpers
This switches the SPEAr PLGPIO driver over to using the irqchip
helpers.
As part of this effort, also get rid of the strange irq_base
calculation and failure to use d->hwirq for obtaining a local
irqchip offset.
Cc: Viresh Kumar <viresh.linux@gmail.com>
Cc: Shiraz Hashim <shiraz.linux.kernel@gmail.com>
Cc: spear-devel@list.st.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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