Update build rules to rely on new dependency target

Change-Id: I646730671e643303fb7f5f78d122a55e35369423
diff --git a/BUILD.gn b/BUILD.gn
index 977b1c7..8cf5d97 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -12,7 +12,7 @@
   name = "rustyline"
   deps = [
     "//garnet/public/rust/crates/fuchsia-device",
-    "//garnet/public/rust/crates/fuchsia-zircon:fuchsia-zircon-rustc",
+    "//garnet/public/rust/crates/fuchsia-zircon",
 
     "//third_party/rust-crates/rustc_deps:log",
     "//third_party/rust-crates/rustc_deps:libc",