remove gsj from CI builds

The machine is no longer being supported.

Change-Id: I84f922761951ce82649110b8fd02d5aecf015aa9
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/jenkins/build-seed b/jenkins/build-seed
index 6e0a678..831e109 100755
--- a/jenkins/build-seed
+++ b/jenkins/build-seed
@@ -28,7 +28,6 @@
     bletchley
     e3c246d4i
     gbs
-    gsj
     p10bmc
     palmetto
     romed8hm3