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/vision/image/image_stream.cc b/aos/vision/image/image_stream.cc
index 1dba674..62f5e81 100644
--- a/aos/vision/image/image_stream.cc
+++ b/aos/vision/image/image_stream.cc
@@ -8,7 +8,7 @@
 void ImageStreamEvent::ProcessHelper(
     DataRef data, aos::monotonic_clock::time_point timestamp) {
   if (data.size() < 300) {
-    LOG(INFO, "got bad img of size(%d)\n", static_cast<int>(data.size()));
+    AOS_LOG(INFO, "got bad img of size(%d)\n", static_cast<int>(data.size()));
     return;
   }
   ProcessImage(data, timestamp);