[SERIAL] Use an enum for serial8250 platform device IDs

Rather than hard-coding the platform device IDs, enumerate them.
We don't particularly care about the actual ID we get, just as
long as they're unique.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/serial/8250_accent.c b/drivers/serial/8250_accent.c
index 1f2c276..9c10262 100644
--- a/drivers/serial/8250_accent.c
+++ b/drivers/serial/8250_accent.c
@@ -29,7 +29,7 @@
 
 static struct platform_device accent_device = {
 	.name			= "serial8250",
-	.id			= 2,
+	.id			= PLAT8250_DEV_ACCENT,
 	.dev			= {
 		.platform_data	= accent_data,
 	},