wifi: ath12k: fix out-of-bound access of qmi_invoke_handler()

Currently, there is no terminator entry for ath12k_qmi_msg_handlers hence
facing below KASAN warning,

 ==================================================================
 BUG: KASAN: global-out-of-bounds in qmi_invoke_handler+0xa4/0x148
 Read of size 8 at addr ffffffd00a6428d8 by task kworker/u8:2/1273

 CPU: 0 PID: 1273 Comm: kworker/u8:2 Not tainted 5.4.213 #0
 Workqueue: qmi_msg_handler qmi_data_ready_work
 Call trace:
  dump_backtrace+0x0/0x20c
  show_stack+0x14/0x1c
  dump_stack+0xe0/0x138
  print_address_description.isra.5+0x30/0x330
  __kasan_report+0x16c/0x1bc
  kasan_report+0xc/0x14
  __asan_load8+0xa8/0xb0
  qmi_invoke_handler+0xa4/0x148
  qmi_handle_message+0x18c/0x1bc
  qmi_data_ready_work+0x4ec/0x528
  process_one_work+0x2c0/0x440
  worker_thread+0x324/0x4b8
  kthread+0x210/0x228
  ret_from_fork+0x10/0x18

 The address belongs to the variable:
  ath12k_mac_mon_status_filter_default+0x4bd8/0xfffffffffffe2300 [ath12k]
 [...]
 ==================================================================

Add a dummy terminator entry at the end to assist the qmi_invoke_handler()
in traversing up to the terminator entry without accessing an
out-of-boundary index.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Fixes: d8899132 ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Karthikeyan Kathirvel <quic_kathirve@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240416080234.2882725-1-quic_kathirve@quicinc.com

drivers/net/wireless/ath/ath12k/qmi.c

@@ -3180,6 +3180,9 @@ static const struct qmi_msg_handler ath12k_qmi_msg_handlers[] = {
 		.decoded_size = sizeof(struct qmi_wlanfw_fw_ready_ind_msg_v01),
 		.fn = ath12k_qmi_msg_fw_ready_cb,
 	},
+
+	/* end of list */
+	{},
 };
 
 static int ath12k_qmi_ops_new_server(struct qmi_handle *qmi_hdl,