serial_bt: add support for JL AC6328 chips (RFCOMM and BLE)

Add support for the JL AC6328B chip which happens to communicate both
RFCOMM (traditional Bluetooth) as well as BLE.

Support was tested with ATORCH USB loads and meters. Add a few product
names so that scans can list the "cable" when detected. Suggest to users
(as part of scan result output) that RFCOMM channel 2 is needed which is
not the default number.