umodem: Add Huawei E3372h-320 device id

After switching the dongle to the Huawei alternate mode(modem mode)
with usb_modeswitch the serial interfaces had all of their ids set to
0xFF.
After modifying umodem to work with that it attached successfully and
I've managed to configure device with standard AT commands to get
internet connection.

(cherry picked from commit 28d549826844b89224f0335b6318eb277031ea78)