ARM: dts: msm: add wcn-bt-ext for enabling second bt backend。

Only add wcn-bt-ext for enabling second bt backend for needed dtsi file.

Change-Id: I42ca1840019a9db7d02ac39092f15dd438ea334f
Signed-off-by: MingShu Pang <quic_mpang@quicinc.com>

sun-audio-cdp-nfc.dtsi

@@ -1,6 +1,10 @@
 // SPDX-License-Identifier: BSD-3-Clause
 /*
- * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2023-2025 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include "sun-audio-cdp.dtsi"
+
+&sun_snd {
+	qcom,wcn-bt-ext = <0>;
+};