Switch submodule back to upstream repo.
diff --git a/.gitmodules b/.gitmodules
index 7d0eaf4..d18f724 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,3 @@
 [submodule "database"]
 	path = database
-	url = https://github.com/cr1901/prjtrellis-db.git
-	branch = facade
+	url = https://github.com/YosysHQ/prjtrellis-db