openocd: drop include of target_type.h

Few files include target_type.h even if it is not needed.
Drop the include.

Other files access directly to target type's name instead of using
the proper API target_type_name().
Use the API and drop the include.

Change-Id: I86c0e0bbad51db93500c0efa27b7d6f1a67a02c2
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8260
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/rtos/nuttx.c

@@ -12,7 +12,6 @@
 
 #include <jtag/jtag.h>
 #include "target/target.h"
-#include "target/target_type.h"
 #include "target/armv7m.h"
 #include "target/cortex_m.h"
 #include "rtos.h"