uwb: fix oops in debug PAL's reservation callback

Initialize pal_priv for reservations created by the debug PAL.
Signed-off-by: David Vrabel <david.vrabel@csr.com>

drivers/uwb/uwb-debug.c

@@ -122,7 +122,7 @@ static int cmd_rsv_establish(struct uwb_rc *rc,
 	if (target == NULL)
 		return -ENODEV;
 
-	rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, NULL);
+	rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, rc->dbg);
 	if (rsv == NULL) {
 		uwb_dev_put(target);
 		return -ENOMEM;