Bluetooth: ATT: add debug log for timeout override

Nice to know the stack's ain't having none of your timeouts.

(cherry picked from commit 28d7d14)

Original-Signed-off-by: Jonathan Rico <jonathan.rico@nordicsemi.no>
GitOrigin-RevId: 28d7d14
Change-Id: Ia0a6cae8b13d14634efcd4444bf812f8db6b05aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5516683
Reviewed-by: Ting Shen <phoenixshen@chromium.org>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Commit-Queue: Ting Shen <phoenixshen@chromium.org>
Tested-by: Ting Shen <phoenixshen@chromium.org>

subsys/bluetooth/host/att.c

@@ -3808,6 +3808,7 @@ struct bt_att_req *bt_att_req_alloc(k_timeout_t timeout)
 		/* No req will be fulfilled while blocking on the bt_recv thread.
 		 * Blocking would cause deadlock.
 		 */
+		LOG_DBG("Timeout discarded. No blocking on bt_recv thread.");
 		timeout = K_NO_WAIT;
 	}