USB: serial: cp210x: add Corsair AX1500i Power Supply

The Corsair AX1500i power supply exposes its Corsair Link monitoring
interface on a mini-USB port through an on-board CP2103, using a
Corsair-specific product ID. Without the ID in the table no driver binds
and no tty is created.

Tested by forcing the driver association with

  echo 1b1c 1c02 > /sys/bus/usb-serial/drivers/cp210x/new_id

and then setting the serial port to 115200 8N1. Adding the ID is sufficient
to talk to the device: the tty reaches a USB-to-SMBus bridge sitting behind
the UART, which identifies itself as "USB to SMB Bridge (Firmware by Ross
Fosler)" version 0.9 and relays PMBus reads to the power supply controller.
Input voltage and current, input and output power, internal temperature and
fan speed were all read back on an AX1500i.

  [    7.806181] usb 3-14: New USB device found, idVendor=1b1c, idProduct=1c02, bcdDevice= 1.00
  [  698.526754] usbcore: registered new interface driver cp210x
  [  698.526767] usbserial: USB Serial support registered for cp210x
  [  698.527863] cp210x 3-14:1.0: cp210x converter detected
  [  698.529263] usb 3-14: cp210x converter now attached to ttyUSB0

The related AX1600i (1b1c:1c11, iProduct "USB API") is expected to be the
same kind of device but has not been tested here, so it is not added.

Cc: stable@vger.kernel.org
Signed-off-by: Jérémy Carrat <jeremy.carrat@icloud.com>
Signed-off-by: Johan Hovold <johan@kernel.org>

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