target: trace: drop useless typedef trace_status_t

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

Change-Id: I31e0e3869c7277bcb14e05cfcac82c9655963ae6
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8704
Tested-by: jenkins
Reviewed-by: zapb <dev@zapb.de>

src/target/etm.c

@@ -1567,7 +1567,7 @@ COMMAND_HANDLER(handle_etm_status_command)
 	struct target *target;
 	struct arm *arm;
 	struct etm_context *etm;
-	trace_status_t trace_status;
+	enum trace_status trace_status;
 
 	target = get_current_target(CMD_CTX);
 	arm = target_to_arm(target);