op-build v2.3-rc2 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/openpower/scripts/release-notes b/openpower/scripts/release-notes
index 6cc966e..27c6bcb 100755
--- a/openpower/scripts/release-notes
+++ b/openpower/scripts/release-notes
@@ -142,6 +142,7 @@
     next if $p =~ /firenze/;
     next if $p =~ /^zz$/;
     next if $p =~ /mambo/;
+    next if $p =~ /opal/;
     next if $p =~ /redbud/;
     next if $p =~ /pseries/;
     next if $p =~ /witherspoon-redbud/;