IXP: Fix missing MACH_TYPE_{ACTUX?,PNB3,DVLHOST}

These symbols are no longer defined in Linux-ARM's mach-types files. Replace
these with CONFIG_MACH_TYPE instead.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Bryan Hundven <bryanhundven@gmail.com>
Cc: Michael Schwingen <rincewind@discworld.dascon.de>
diff --git a/include/configs/actux1.h b/include/configs/actux1.h
index 00780d0..bdd2239 100644
--- a/include/configs/actux1.h
+++ b/include/configs/actux1.h
@@ -29,6 +29,8 @@
 #define CONFIG_IXP425			1
 #define CONFIG_ACTUX1			1
 
+#define	CONFIG_MACH_TYPE		1479
+
 #define CONFIG_DISPLAY_CPUINFO		1
 #define CONFIG_DISPLAY_BOARDINFO	1