pinctrl: armada-37xx: Add edge both type gpio irq support

Current edge both type gpio irqs which need to swap polarity in each
interrupt are not supported, this patch adds edge both type gpio irq
support.

Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>