Add multinode maps and type specific maps.

This lets us do things like remap timing reports per node and handle
them correctly.  And also only map the timing reports and not everything
on /aos.  This also becomes more interesting when AOS_LOG logs, and we
have a starter which publishes statistics.

Change-Id: I2147e3b722b472d4480c86e7c8acda938aa3d1d2
diff --git a/aos/configuration.fbs b/aos/configuration.fbs
index ef25959..36dbacd 100644
--- a/aos/configuration.fbs
+++ b/aos/configuration.fbs
@@ -36,6 +36,7 @@
 table Map {
   // Channel to match with.  If the name in here matches, the name is replaced
   // with the name in rename.
+  // Node specific matches are also supported.
   match:Channel;
   // The channel to merge in.
   rename:Channel;