gpio: ep93xx: Make irqchip immutable
This turns the Cirrus ep93xx gpio irqchip immutable. Preserve per-chip labels by adding an ->irq_print_chip() callback. Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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