MAINTAINERS: Add one collaborator for Bluetooth Classic

Add chengkai15 as collaborator for Bluetooth Classic.

Signed-off-by: Lyle Zhu <[email protected]>

Author: lylezhu2012

MAINTAINERS.yml

@@ -457,6 +457,7 @@ Bluetooth Classic:
     - MarkWangChinese
     - gzh-terry
     - makeshi
+    - chengkai15
   files:
     - doc/connectivity/bluetooth/shell/classic/a2dp.rst
     - subsys/bluetooth/common/