ARM: dts: am437x: pixcir_tangoc: use correct flags for irq types

Now IRQs for Pixcir Tangoc touchscreen are defined using
IRQ_TYPE_NONE in am437x-gp-evm.dts and am43x-epos-evm.dts wich
do not correspond HW.

Hence, update am437x-gp-evm.dts and am43x-epos-evm.dts files
and use correct flag IRQ_TYPE_EDGE_FALLING for irq types.

While here, remove duplicated irq declaration for pixcir_ts@5c node
in am437x-gp-evm.dts.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/boot/dts/am43x-epos-evm.dts b/arch/arm/boot/dts/am43x-epos-evm.dts
index 746fd2b..d580e2b7 100644
--- a/arch/arm/boot/dts/am43x-epos-evm.dts
+++ b/arch/arm/boot/dts/am43x-epos-evm.dts
@@ -491,7 +491,7 @@
 		pinctrl-0 = <&pixcir_ts_pins>;
 		reg = <0x5c>;
 		interrupt-parent = <&gpio1>;
-		interrupts = <17 0>;
+		interrupts = <17 IRQ_TYPE_EDGE_FALLING>;
 
 		attb-gpio = <&gpio1 17 GPIO_ACTIVE_HIGH>;