[build] //zircon/public/fidl --> //zircon/system/fidl

Bug: 35562
Change-Id: I011aa418c4c8a3b61e42160231ce18f4c1003ee0
diff --git a/BUILD.gn b/BUILD.gn
index 6bab6ff..7dcc4ee 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -135,7 +135,7 @@
     "//garnet/public/lib/syslog/cpp",
     "//third_party/re2",
     "//third_party/snappy",
-    "//zircon/public/fidl/fuchsia.io",
+    "//zircon/system/fidl/fuchsia-io",
     "//zircon/public/lib/async",
     "//zircon/public/lib/async-loop-cpp",
     "//zircon/public/lib/fdio",