target files shouldn't #include <target/...h>

Make these ".h" files adopt the same policy the ".c" files already
follow:  don't use <subsystem/...h> syntax for private interfaces.

If we ever get reviewed/supported "public" interfaces they should
come exclusively from some include/... directory; that'll be the
time to switch to <...> syntax for any subsystem's own interfaces.

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

src/target/oocd_trace.h

@@ -20,8 +20,6 @@
 #ifndef OOCD_TRACE_H
 #define OOCD_TRACE_H
 
-#include <target/etm.h>
-
 #include <termios.h>
 
 /* registers */