Add ipv6only build for rpc target, to not run out of ram when linking after #28104 (#28276)

Co-authored-by: Andrei Litvin <andreilitvin@google.com>
diff --git a/integrations/cloudbuild/smoke-test.yaml b/integrations/cloudbuild/smoke-test.yaml
index 05511e2..a745ee1 100644
--- a/integrations/cloudbuild/smoke-test.yaml
+++ b/integrations/cloudbuild/smoke-test.yaml
@@ -32,7 +32,7 @@
               ./scripts/build/build_examples.py --enable-flashbundle --target
               esp32-devkitc-light-rpc --target
               esp32-m5stack-all-clusters-ipv6only --target
-              esp32-m5stack-all-clusters-rpc --target
+              esp32-m5stack-all-clusters-rpc-ipv6only --target
               esp32-m5stack-light --target
               esp32-m5stack-light-ipv6only --target
               esp32-m5stack-ota-requestor build --create-archives