update/fix IXDP425 / IXDPG425 boards

Signed-off-by: Michael Schwingen <michael@schwingen.org>
diff --git a/boards.cfg b/boards.cfg
index b1f79eb..dfefc3f 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -173,7 +173,7 @@
 actux4                       arm         ixp
 dvlhost                      arm         ixp
 ixdp425                      arm         ixp
-ixdpg425                     arm         ixp
+ixdpg425                     arm         ixp         ixdp425
 lpd7a400                     arm         lh7a40x     lpd7a40x
 lpd7a404                     arm         lh7a40x     lpd7a40x
 balloon3                     arm         pxa