Revert "ARM: dts: am437x-sk-evm: Correct tps65218 irq type"

This reverts commit 561f9bcf.

While the correct IRQ level fixed the WARN_ON(), but prevented the probe
of tps65218 as GIC_SPI does not support LEVEL_LOW (?)

Use LEVEL_HIGH as it looks to be the accurate one since the INTn of TPS is
connected to NMIn of the SoC.

Fixes: 561f9bcf ("ARM: dts: am437x-sk-evm: Correct tps65218 irq type")
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-sk-evm.dts

@@ -429,7 +429,7 @@
 	tps@24 {
 		compatible = "ti,tps65218";
 		reg = <0x24>;
-		interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_LOW>;
+		interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
 		interrupt-controller;
 		#interrupt-cells = <2>;