jtag: drop useless typedef tap_state_t

No need to use a typedef for an enum.
Drop it.

Change-Id: I9eb2dc4f926671c5bb44e61453d92880e3036848
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8709
Tested-by: jenkins
Reviewed-by: zapb <dev@zapb.de>

src/target/xtensa/xtensa_debug_module.c

@@ -60,7 +60,7 @@ static void xtensa_dm_add_dr_scan(struct xtensa_debug_module *dm,
 	int len,
 	const uint8_t *src,
 	uint8_t *dest,
-	tap_state_t endstate)
+	enum tap_state endstate)
 {
 	struct scan_field field;