ARM: dts: exynos: Add pinctrl for Midas fuelgauge IRQ pin

This pin is externally pulled up, so we should disable the SoC's
pull down resistor in order for the interrupt to function properly.

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