#include "target.h" less wildly

Don't include "target.h" from more headers than necessary.  This
avoids needless interdependencies and duplicated include paths.

Don't needlessly include it in source files, either.

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

src/flash/at91sam3.c

@@ -62,7 +62,6 @@
 #include <stddef.h>
 #include "types.h"
 #include "flash.h"
-#include "target.h"
 #include "membuf.h"
 #include "at91sam3.h"
 #include "time_support.h"