Bluetooth: tester: Support BR L2CAP channel data receiving

Add the function `br_alloc_buf_cb()` to allocate receiving buffer for
BR L2CAP channel.

Add the function `br_recv_cb()` to report the received BR L2CAP
channel data.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>
1 file changed