kernel: remove SEND_BLOCKED and REPLY_BLOCKED statuses from ports

this allows a port to be used by multiple threads at the same time

kernel/channel.c

@@ -102,7 +102,6 @@ static struct msg *get_next_msg(
 		switch (msg->msg_status) {
 		case KMSG_WAIT_RECEIVE:
 			msg->msg_status = KMSG_WAIT_REPLY;
-			msg->msg_sender_port->p_status = PORT_REPLY_BLOCKED;
 			channel->c_msg_waiting--;
 			return msg;
 		case KMSG_ASYNC:

kernel/port.c

@@ -148,7 +148,6 @@ kern_status_t port_send_msg(
 
 	unsigned long flags;
 	channel_lock_irqsave(port->p_remote, &flags);
-	port->p_status = PORT_SEND_BLOCKED;
 	channel_enqueue_msg(port->p_remote, &msg);
 	channel_unlock_irqrestore(port->p_remote, flags);