ARM: dts: exynos: Add max77693 pinctrl config for Midas

Currently, we assume that the bootloader has correctly configured
the interrupt pin for max77693. This might not actually be the case -
so it's better to configure it explicitly.

Signed-off-by: Simon Shields <simon@lineageos.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>