[SERIAL] uart_port iotype member should use UPIO_*

Convert usage of SERIAL_IO_* to UPIO_*.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/ppc/platforms/chestnut.c b/arch/ppc/platforms/chestnut.c
index 48a4a51..aefcc0e 100644
--- a/arch/ppc/platforms/chestnut.c
+++ b/arch/ppc/platforms/chestnut.c
@@ -116,7 +116,7 @@
 	port.uartclk = BASE_BAUD * 16;
 	port.irq = UART0_INT;
 	port.flags = STD_COM_FLAGS | UPF_IOREMAP;
-	port.iotype = SERIAL_IO_MEM;
+	port.iotype = UPIO_MEM;
 	port.mapbase = CHESTNUT_UART0_IO_BASE;
 	port.regshift = 0;