target: less implicit inclusion of "etm.h"

Don't include it in more headers than necessary; just
use it in the few files that actually need it.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

src/target/armv4_5.h

@@ -27,7 +27,7 @@
 #define ARMV4_5_H
 
 #include "target.h"
-#include "etm.h"
+#include "log.h"
 
 typedef enum armv4_5_mode
 {