Bazel: Expose prolog rules to plugin API

Since change Iedefe1f0f82 prolog rules were extracted to its own
package. Expose the new rule also in plugin API, so that the plugins
can depend on it.

Release-Notes: skip
Change-Id: Ibd3fa93cf355de44c9d7dbb14644ec773158f52b
diff --git a/plugins/BUILD b/plugins/BUILD
index 39560c5..b9c51e3 100644
--- a/plugins/BUILD
+++ b/plugins/BUILD
@@ -62,6 +62,7 @@
     "//java/com/google/gerrit/server/data",
     "//java/com/google/gerrit/server/git/receive",
     "//java/com/google/gerrit/server/logging",
+    "//java/com/google/gerrit/server/rules/prolog",
     "//java/com/google/gerrit/server/schema",
     "//java/com/google/gerrit/server/util/time",
     "//java/com/google/gerrit/proto",