ARM: mstar: Fill in GPIO controller properties for infinity

Fill in the properties needed to use the GPIO controller
in the infinity and infinity3 chips.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20201129110803.2461700-6-daniel@0x0f.com

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>