Bluetooth: SDP: Notify partial records if RX buf is full

In current implementation, if the response total data length is more
than the receiving buffer size, the request cannot be completed
properly.

Improve the SDP client with the following changes,
o Notify the received completed SDP records if the case occurs, and
  then start the continuing SDP discovery,
o Stop the SDP discovery if the hold SDP record cannot be saved to the
  receiving buffer,
o Stop the SDP discovery if the `BT_SDP_DISCOVER_UUID_STOP` is
  returned by upper layer.

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