tests: bluetooth: shell: test a2dp on mimxrt1060_evk + murata 1xk

add the mimxrt1060_evk hci uart overlay file.

Signed-off-by: Mark Wang <[email protected]>

Author: MarkWangChinese

tests/bluetooth/shell/boards/mimxrt1060_evk.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2023 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,bt-uart = &lpuart3;
+	};
+};
+
+&lpuart3 {
+	status = "okay";
+	current-speed = <3000000>;
+	hw-flow-control;
+};