pinctrl: sunxi: add GPIO in/out wrappers

So far we were open-coding the pincontroller's GPIO output/input access
in each function using that.

Provide functions that wrap that nicely, and follow the existing pattern
(set/get_{bank,}), so users don't need to know about the internals, and
we can abstract the new D1 pinctrl more easily.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>

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