[PATCH] mips: add missing IP22 Zilog bit

From: Ralf Baechle <ralf@linux-mips.org>

Add missing definition PORT_IP22ZILOG which is need by ip22zilog driver.

include/linux/serial_core.h

@@ -85,6 +85,9 @@
 /* Samsung S3C2410 SoC and derivatives thereof */
 #define PORT_S3C2410    55
 
+/* SGI IP22 aka Indy / Challenge S / Indigo 2 */
+#define PORT_IP22ZILOG	56
+
 #ifdef __KERNEL__
 
 #include <linux/config.h>