Bluetooth: SDP: Check data len consistency between total and received

Add fields `total_len` and `recv_len` to `struct bt_sdp_client`.

Save the total length of the response to `total_len`.
Save the received data length of the response to the `recv_len`.

Check the consistency between `total_len` and `recv_len` after all of
the response packets are received.

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