USB: serial: option: add WeTelecom 0x6802 and 0x6803 products

[ Upstream commit 40d9c32525cba79130612650b1abc47c0c0f19a8 ]

These product IDs are listed in Windows driver.
0x6803 corresponds to WeTelecom WM-D300.
0x6802 name is unknown.

Signed-off-by: Aleksandr Makarov <aleksandr.o.makarov@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>