ARM: dts: exynos: correct PMIC interrupt trigger level on Snow

ARM: dts: exynos: correct PMIC interrupt trigger level on Snow

[ Upstream commit 8987efbb17c2522be8615085df9a14da2ab53d34 ]

The Maxim PMIC datasheets describe the interrupt line as active low
with a requirement of acknowledge from the CPU.  Without specifying the
interrupt type in Devicetree, kernel might apply some fixed
configuration, not necessarily working for this hardware.

Additionally, the interrupt line is shared so using level sensitive
interrupt is here especially important to avoid races.

Fixes: c61248afa819 ("ARM: dts: Add max77686 RTC interrupt to cros5250-common")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201210212534.216197-9-krzk@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>