brcm63xx: fix external IRQ edge type sense

Fix the register for configuring rising/falling edge

Rising should be sense=1, and falling sense=0.
The old driver used these values, but the new one have
them flipped.

Signed-off-by: Daniel Gonzalez Cabanelas <dgcbueu@gmail.com>

target/linux/brcm63xx/patches-4.4/321-irqchip-add-support-for-bcm6345-style-external-inter.patch

@@ -201,10 +201,10 @@ Signed-off-by: Jonas Gorski <jogo@openwrt.org>
 +		break;
 +
 +	case IRQ_TYPE_EDGE_RISING:
++		sense = 1;
 +		break;
 +
 +	case IRQ_TYPE_EDGE_FALLING:
-+		sense = 1;
 +		break;
 +
 +	case IRQ_TYPE_LEVEL_HIGH: