[ARM] 3391/1: use PLAT8250_DEV_PLATFORM{,1} for platform device id instead of 0/1

Patch from Lennert Buytenhek

This patch changes iop3xx and omap2 and to use PLAT8250_DEV_PLATFORM{,1}
as platform device id instead of just hardcoding 0/1 directly.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 24dd374..0884bc7 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -167,7 +167,7 @@
 
 static struct platform_device serial_device = {
 	.name			= "serial8250",
-	.id			= 0,
+	.id			= PLAT8250_DEV_PLATFORM,
 	.dev			= {
 		.platform_data	= serial_platform_data,
 	},