build-seed: remove yv2 and tiogapass

Meta is no longer actively developing the Yv2 or Tiogapass systems and
is likely to deprecate them.  Remove them from the build-seed since they
have been dropped from Jenkins as well.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia96b14e4548547a421b2b237d0e9cd55a29af4a6
diff --git a/jenkins/build-seed b/jenkins/build-seed
index f7d5338..6e0a678 100755
--- a/jenkins/build-seed
+++ b/jenkins/build-seed
@@ -33,9 +33,7 @@
     palmetto
     romed8hm3
     romulus
-    tiogapass
     witherspoon
-    yosemitev2
     yosemite4
     zaius
 )