feat(driver_twai): support using all 4 hardware tx buffer

components/hal/esp32s2/include/hal/twai_ll.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -622,6 +622,17 @@ static inline void twai_ll_set_acc_filter(twai_dev_t *hw, uint32_t code, uint32_
 
 /* ------------------------- TX/RX Buffer Registers ------------------------- */
 
+/**
+ * @brief Get the number of TX buffers that are preset in the hardware.
+ *
+ * @param hw Pointer to the TWAI-FD device hardware.
+ * @return The number of TX buffers available.
+ */
+static inline uint32_t twai_ll_get_tx_buffer_total(twai_dev_t *hw)
+{
+    return 1;   // only one TX buffer
+}
+
 /**
  * @brief   Copy a formatted TWAI frame into TX buffer for transmission
  *