[POWERPC] 86xx: Fix the wrong serial1 interrupt for 8610 board

Signed-off-by: Jason Jin <Jason.jin@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/mpc8610_hpcd.dts

@@ -105,7 +105,7 @@ serial1: serial@4600 {
 			compatible = "ns16550";
 			reg = <0x4600 0x100>;
 			clock-frequency = <0>;
-			interrupts = <28 2>;
+			interrupts = <42 2>;
 			interrupt-parent = <&mpic>;
 		};