ARM: dts: kirkwood: Add definitions for PCIe error interrupts

First PCIe controller on Kirkwood SoC reports error interrupt via IRQ 44
and second PCIe controller via IRQ 45.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>