[build] Break SDK dependency cycle

Previously, we were trying to include the SDK as a package without the
system build that was included in the SDK.

Change-Id: I7c549b8476e8b544882f406c9fc7249e88a2bfd7
diff --git a/packages/sdk/BUILD.gn b/packages/sdk/BUILD.gn
index 7759057..f899ef0 100644
--- a/packages/sdk/BUILD.gn
+++ b/packages/sdk/BUILD.gn
@@ -12,6 +12,6 @@
 group("topaz") {
   testonly = true
   public_deps = [
-    "//topaz/public/sdk:topaz",
+    "//topaz/public/sdk",
   ]
 }