Added make_hybrid_drivetrain_velocity_loop to drivetrain_config

Change-Id: I66dde6ddf0fc63c794d6b11ff2a2131005902953
diff --git a/frc971/control_loops/drivetrain/BUILD b/frc971/control_loops/drivetrain/BUILD
index c37f379..7f87cca 100644
--- a/frc971/control_loops/drivetrain/BUILD
+++ b/frc971/control_loops/drivetrain/BUILD
@@ -34,6 +34,7 @@
     ],
     deps = [
         "//frc971:shifter_hall_effect",
+        "//frc971/control_loops:hybrid_state_feedback_loop",
         "//frc971/control_loops:state_feedback_loop",
     ],
 )