Enable automatic transition for darp6

There shouldn't be any issues with Open EC on the darp6 now, and this
shouldn't have any noticeable harm while enabling things like the
Keyboard Configurator to work without manual transition.

src/transition.rs

@@ -1,7 +1,7 @@
 // Make sure this is up to date with support article
 static TRANSITIONS: &'static [Transition] = &[
     Transition::new("addw2", "PBx0Dx2", false),
-    Transition::new("darp6", "N150CU", false), // TODO: set liberate to true
+    Transition::new("darp6", "N150CU", true),
     // 17-inch 1660Ti
     Transition::new_variant("gaze15", 0, "NH5xDC", false),
     // 15-inch 1660Ti