[ARM] Fix IXDP425 setup bug

There is a typo in the ARM IXDP425 setup definition that mistakenly tries
to use UART1's IRQ for UART2's traffic.

Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/mach-ixp4xx/ixdp425-setup.c

···
 	{
 		.mapbase	= IXP4XX_UART2_BASE_PHYS,
 		.membase	= (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
-		.irq		= IRQ_IXP4XX_UART1,
+		.irq		= IRQ_IXP4XX_UART2,
 		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 		.iotype		= UPIO_MEM,
 		.regshift	= 2,