Prefix LOG and CHECK with AOS_

This prepares us for introducing glog more widely and transitioning
things over where they make sense.

Change-Id: Ic6c208882407bc2153fe875ffc736d66f5c8ade5
diff --git a/aos/input/drivetrain_input.cc b/aos/input/drivetrain_input.cc
index eddbdc5..a0bbf2c 100644
--- a/aos/input/drivetrain_input.cc
+++ b/aos/input/drivetrain_input.cc
@@ -100,7 +100,7 @@
   new_drivetrain_goal->linear.max_acceleration = 20.0;
 
   if (!new_drivetrain_goal.Send()) {
-    LOG(WARNING, "sending stick values failed\n");
+    AOS_LOG(WARNING, "sending stick values failed\n");
   }
 
   last_is_control_loop_driving_ = is_control_loop_driving;