Split out statespace drivetrain code.

Change-Id: I02900583abfab39b2d85473bd245ffd6bf421d58
diff --git a/y2014/control_loops/drivetrain/BUILD b/y2014/control_loops/drivetrain/BUILD
index 97fe62c..fa29692 100644
--- a/y2014/control_loops/drivetrain/BUILD
+++ b/y2014/control_loops/drivetrain/BUILD
@@ -79,6 +79,28 @@
 )
 
 cc_library(
+  name = 'ssdrivetrain',
+  srcs = [
+    'ssdrivetrain.cc',
+  ],
+  hdrs = [
+    'ssdrivetrain.h',
+  ],
+  deps = [
+    ':drivetrain_queue',
+    '//y2014:constants',
+    '//aos/common/controls:polytope',
+    '//aos/common:math',
+    '//aos/common/messages:robot_state',
+    '//frc971/control_loops:state_feedback_loop',
+    '//frc971/control_loops:coerce_goal',
+    '//aos/common/util:log_interval',
+    '//aos/common/logging:queue_logging',
+    '//aos/common/logging:matrix_logging',
+  ],
+)
+
+cc_library(
   name = 'polydrivetrain',
   srcs = [
     'polydrivetrain.cc',
@@ -111,11 +133,9 @@
   deps = [
     ':drivetrain_queue',
     ':polydrivetrain',
+    ':ssdrivetrain',
     '//aos/common/controls:control_loop',
     '//y2014:constants',
-    '//aos/common:math',
-    '//frc971/control_loops:state_feedback_loop',
-    '//frc971/control_loops:coerce_goal',
     '//frc971/queues:gyro',
     '//aos/common/util:log_interval',
     '//aos/common/logging:queue_logging',