net: qmi_wwan: use a single bind function for all device types
Refactoring the bind code lets us use a common driver_info struct
for all supported devices, simplifying the code a bit. The
real advantage is that devices using the CDC ECM interface
layout now also can be added dynamically using the new_id sysfs
interface. This simplifies testing of new devices.
Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>