Bluetooth: Host: Remove unused include

There's no need for scan.h in direction.c.

Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>

Author: jhedberg

subsys/bluetooth/host/direction.c

@@ -16,7 +16,6 @@
 #include <zephyr/bluetooth/direction.h>
 
 #include "hci_core.h"
-#include "scan.h"
 #include "conn_internal.h"
 #include "direction_internal.h"