change #include "trace.h" to <target/trace.h>

Changes from the flat namespace to heirarchical one.  Instead of writing:

	#include "trace.h"

the following form should be used.

	#include <target/trace.h>

The exception is from .c files in the same directory.

src/target/etm.h

@@ -23,7 +23,7 @@
 #ifndef ETM_H
 #define ETM_H
 
-#include "trace.h"
+#include <target/trace.h>
 #include <target/arm_jtag.h>
 
 struct image;